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RVSAO Revision Log

2.8.3, July 6, 2015
* All .com and .h files are  in rvsao$lib only
BCVCORR: Fix bug keeping JD from parameter file
EMSAO,PEMSAO: Initialize savespec to FALSE
LISTSPEC: Bug fixed so appropriately-named file is written if requested
xcplot.x: Set qplot=TRUE if spectrum is edited

2.8.2, June 13, 2014
* Edit cosmic rays out of a spectrum by resetting a point at a time
* (using the , key) or by linearly interpolating between points on 
* either side of a cosmic ray (using the d key twice).  The edited 
* spectrum is automatically written out if you are running qplot or 
* are saving information to the spectrum header and leave with "q".
XCSAO,EMSAO,PXCSAO,PEMSAO: Write back edited spectrum
xcfit.x: Call putspec to update spectrum after editing it (2014-05-02)
emplot.x: Fix bug which reversed red and blue limits (2013-03-15)
emplot.x: Add , command to replace individual pixel values (2014-05-01)
emplot.x: Add > command to write out edited spectrum (2014-05-02)
t_eqwidth.x: Drop declaration of results.com; it's not used

2.8.1, May 25, 2012
PXCSAO: Add maxlength parameter to set output spectrum file length in mode 11
xcrslts.x: add parameter maxlength to allow longer filename in mode 11

2.8.0, April 13, 2012
LISTSPEC: Add velform format for velocity per pixel output
SKYPLOT: Base on PEMSAO instead of XCSAO, like EMPLOT
juldate.x: Do not recompute HJD if already in header
juldate.x: Check for BJD as well as HJD
vcombine.x: Do not add constant dispersion error of 15 km/sec any more
xcfile.x: Only include file name in xc file if given full pathname
xcfile.x: Drop ".ms.fits" and ".fits" from object and template filenames
xcfile.x: Add ".xcor" file extension to output filename
xcfile.x: Fix bug by redimensioning title from SZ_LINE to SZ_PATHNAME
Add new shell script rvsaopar to set RVSAO task parameters from a dpar file
Add new shell script pxcsao to execute PXCSAO

2.7.9, August 11, 2010
PEMSAO: Write median (MEDPIX) and mean (MEANPIX) pixel shift to image header
PEMSAO: Do not write back to parameter file if save_vel=yes
PEMSAO: Skip apertures where no lines are found for means and medians
PEMSAO and PXCAO: Set FITS extension with specext keyword
PXCSAO and XCSAO: initialize all pointers to NULL; free only if not NULL
xcfit.x: Return properly if there is an error reading a spectrum
getspec.x: Return error if spectrum has no non-zero pixels
getimage.x:  If stacked spectra and CD2_2 is not set, set it to 1
getimage.x:  Always add extension to file name, even if it is zero

2.7.8, November 20, 2009
XCSAO, PXCSAO, EMSAO, PEMSAO: Zoom and line identification changes in emplot.x
LISTSPEC,PIX2WL,WL2PIX: Increase image string size to SZ_PATHNAME(511) from SZ_FNAME(255)
emplot.x: Fix zoom at left and right edges of a displayed spectrum.
          Replot immediately with new velocity if line selected
          Mark VELOCITY as being used if it is guessed from a line
          Change to correlation velocity automatically if switching templates
getimage.x: Increase image string size to SZ_PATHNAME(511) from SZ_FNAME(255)

2.7.7, July 28, 2009
XCSAO: If DIVCONT is T in object spectrum, divide it by its continuum and
       subtract 1.0 instead of subtracting the continuum; do the same with
       all templates, if they have no SUBCONT flag.
XCSAP,PXCSAO: Increase maximum number of point sin peak fir from 512 to 1024 for TRES
XCSAO,EMSAO: If contspec.order is zero, do not remove continuum
XCSAO,EMSAO,SUMSPEC: If dividing continuum, normalize by mean of continuum
       to get the true variation in count rates.
EQWIDTH: Compute sigma according to John Huchra's new formula

2.7.6, June 15, 2009
WLRANGE: New task to return the overlapping wavelength range for a list of spectra

2.7.5, June 10, 2009
EQWIDTH: Major changes to make it more robust and handle rest wavelengths right
EMSAO, PEMSAO: Fix multiple aperture plotting so it doesn't crash or print blank lines
PEMSAO: Compute lambda/pix by offset from line center to avoid dividing by
        zero if line is exactly at rest wavelength (as for a sky or
        calibration lamp line)
SUMSPEC: Fix bugs so that rebinned wavelength range can be computed from
         overlap
emrslts.x: Return immediately if no log file is set
emplot.x: Get number of apertures from im structure, not smw
emlines.dat: Add Lyman Beta and Gamma; move Lyamn Alpha from 1215.7 to 1215.67
             Fix name of 1240.0 from LyA to NV

2.7.4, April 24, 2009
BCFCORR: Add SUBGRAV parameter to make solar gravitational redshift subtraction
         from twilight sky spectra optional
LISTSPEC: Allow multiple apertures and write them to separate files
EQWIDTH: Fix error computation for equivalent widths and indices
SUMSPEC: Handle spectra with PIXEL WCS correctly
getimage.x: Set RA, DEC, ST, HA to 0:00 if not in header [for shdr_open()]
juldate.x: Add MJD as possible JD header keyword; return hjd = jd if
           there is no pointing direction in the image header

2.7.3, March 31, 2009
Add new shell scripts in Shell/ to run most RVSAO tasks on the Unix/Linux
command line.

2.7.2, March 13, 2009
XCSAO: Add option to shift orders when cross-correlating echelle spectra

2.7.1, February 20, 2009
EMSAO,XCSAO: Assume RA is in degrees if decimal keyword value, not hours

2.7.0, January 30, 2009
SUMSPEC: Fix bug which put back heliocentric velocity correction when shifting
         to a specific velocity and delete IRAF WCS keywords if one spectrum
         is being rebinned.
EQWIDTH: Fix error of index so that it is at least closer to correct.
         Fix bug so that a lack of a VELOCITY or BCV keyword does not crash
         the program.  Clean up exposure scaling.

2.6.9, December 9, 2008
EQWIDTH: Correctly compute Index and Index Error; Set to 0.0 if no continuum
EMSAO,EMPLOT: Plot line name and wavelength if only labeling emission lines
Add emlineshe2.dat He2 line list

2.6.8, October 7, 2008
EMSAO,EMPLOT: Add ) and ( commands to move through orders or apertures

2.6.7, September 16, 2008
RVRELEARN: New task to relearn all of the parameters from all of the tasks
           in RVSAO.  Old parameters keep their values; new parameters will
           be assigned default values.
SUMSPEC: Keep pointing direction if numbers of input and output apertures are 
         the same.

2.6.6, September 11, 2008
PEMSAO: Set median and quartile velocity shift, plus mean and median pixel
        and wavelength shift parameters for multiple aperture computations.
PIX2WL: New task to return wavelength at a specified pixel in a spectrum or if
        the pixel value is zero, the range in wavelength covered by the image.
WL2PIX: New task to return the pixel of a wavelength in a spectrum specified
        in Angstroms.
emplot.c: Add a decimal place to wavelengths and print FP pixel in "w" (2008-09-11)

2.6.5 July 8, 2008
EQWIDTH: Add error computation and 3 additional reporting modes
EQWIDTH: Add bandfilt parameter to indicate whether band filters are present
EQWIDTH: Add bandcont parameter to indicate whether continuum names are present
EQWIDTH: Add banddir to specify directory for band file
EMPLOT: New task to plot spectra and label lines without fitting emission lines
SKYPLOT: New task to plot sky spectra and label emission lines
XCPLOT: New task to plot spectra without cross-correlating (a simpler splot)
XCSAO,PXCSAO: Fix transform filtering so that zero-padded spectra
        really are unfiltered.  The toplo, topnrun, and nrun numbers are
        now doubled when zeropad=yes, as they should have been all along.
XCSAO,PXCSAO,SUMSPEC: Fix old bug with log wavelength SUMS rebinning.
        Bad velocities were possible if using log-wavelength templates which
        were not created using SUMS rebinning.
XCSAO,PXCSAO,EMSAO,PEMSAO: Fix results printing subroutines so they
        have fewer string constants so they will compile on Solaris IRAF

getimage.x: Fix recent bug which caused problems if file name extensions assumed
rebin.x: Compute edges of pixels for SUMS log wavelength rebinning in rebinl()

CL scripts have been moved into the Scripts/ subdirectory.
Shell scripts have been moved into the Shell/ subdirectory and suffixes dropped.

2.6.4 May 9, 2008
XCSAO, EMSAO, SUMSPEC: if bad line file line name starts with "pix",
        interpolate between specified pixels rather than specified wavelengths.
XCSAO,PXCSAO: If SUBCONT=F in object header, continuum is not removed.
XCSAO,PXCSAO: If filling between pixel limits, fill template(s), too.
        Ignore world argument in getimage.x; resetting header parameters
        confuses shdr_open() when there is a nonlinear IRAF spectrum WCS.
EMSAO, XCSAO: increase maximum number of emission lines to 500 for
        multi-order ThAr spectra.
EMSAO,PEMSAO: If wavelength limit parameters are negative go in the absolute
        value of that many Angstroms from the appropriate end of the spectrum.
EMSAO,PEMSAO: Increase maximum number of combination emisson line sets
        from 5 to 20
SUMSPEC: Add missing argument in addspec() call to filllist()
PEMSAO: Save mean velocity to meanvel parameter and error to meanerr parameter
PXCSAO: Save as parameters median and quartile velocities for echelle
LISTSPEC: New task to print spectra

2.6.3 February 11, 2008
XCSAO,PXCSAO: Increase maximum number of templates to 3000
XCSAO: Add report mode 18 for TRES results

2.6.2 January 14, 2008
SUMSPEC: Remove barycentric velocity correction when summing to velocity
SUMSPEC: Fix bug so spectra can be added again
PXCSAO: Save mean velocity shift of apertures (=orders) if echelle

2.6.1 October 15, 2007
SUMSPEC: Fix boolean check in writetemp.x so it compiles on MacIntel
XCSAO: Fix boolean check in xcplot.x so it compiles on MacIntel

2.6.0 September 3, 2007
PXCSAO: New task which writes best template, velocity, error, and r-value
        to its parameter file to make it easier to use in CL scripts.
PEMSAO: New task which writes number of lines fit, velocity, error, height,
        width, and equivalent width of the first emission line in its list
        to make it easier to use in CL scripts.
XCSAO,PXCSAO: Drop all cache pointers from xcfit.x and rvsao.com.
        Add xplt.com containing pointers for plotting buffers in xcplot.x and
        xcorplot.x.  They are allocated to the maximum size needed and freed
        at the end of t_xcsao.x and t_pxcsao.x.
QPLOT: Fix dropped line in xcfit.x so this works again
BCVCORR: Dropped commas from prompt for parameter savejd in bcvcorr.par

2.5.9 June 21, 2007
XCSAO: Allocate all transform vectors, so number of bins is unlimited
BCVCORR: Add printmode, returned bcv and hcv parameters, and savejd to
separate saving of date and velocity (savebcv) information in image header.

2.5.8 June 14, 2007
getimage.x: If APIDi present, read RA and DEC as strings, not numbers

2.5.7 April 6, 2007
XCSAO: Print last 27 characters of template in report mode 17 (-.fits)
XCSAO: Print object name as "filename_aperture", not "filename [aperture]"
EMSAO: Fix bug which caused line finding to fail if wavelength increased left to right
SUMSPEC: Fix exposure time addition bug

2.5.6 February 14, 2007
SUMSPEC: Preserve APNUMi keywords when linearizing multi-aperture multispec image

2.5.5 February 1, 2007
EMSAO and XCSAO: Plot all emission lines if any, not just those found
XCSAO: Do not modify data structure when dropping leading and trailing zeroes
XCSAO: Fix bug which caused wavelength range to shrink spontaneously
QPLOT,XCSAO,EMSAO: Always label lines after identifying one
QPLOT,XCSAO,EMSAO:  Add 'l' option to 's' option to set velocity from
identified line with error of 300 km/sec to avoid having to type in the numbers
QPLOT,XCSAO: Re-cross-correlate using velocity of identified line as guess on f

2.5.4 October 24, 2006
XCSAO: Increase maximum number of templates from 256 to 512 (rvsao.h)

2.5.3 September 27, 2006
XCSAO: Fix normalization bug to now divide by mean *before* adding floor

2.5.2 August 17, 2006
XCSAO: Do not use pixels at either end of spectrum with values of zero

2.5.1 July 13, 2006
XCSAO, EMSAO: Do not read per-aperture info for apertures > 999

2.5.0 June 1, 2006
XCSAO: Add report mode 17 for Hectochelle
getimage.x: Extract name, position, beam, and fiber from APID keywords

2.4.9 May 19, 2006
XCSAO: rename rcomp to rcompx to fix Fedora Core 5 problem
EMSAO: clone rcomp to rcompe to fix Fedora Core 5 problem
SUMSPEC: keep all-zero spectra
icsubcon.x:  Return fit and spectrum as all zeroes if spectrum is all zeroes
xchead.x: Fix multi-line header COMMENT concerning templates so it works

2.4.8 March 9, 2006
*BCVCORR:  Add new parameter specsun to use direction of sun instead of
       pointing direction if set (for twilight sky spectra) *relearn bcvcorr*
       Add parameter to specify when time is during observation
       Decode UT from FITS DATE-OBS keyword value if it is there
       Allow JD- and MJD-containing keywords as time
XCSAO: Free two wavelength structures which were allocated for every spectrum
       This caused memory overflows when processing many spectra in a loop
XCSAO,EMSAO: Add ZERR z error to header
XCSAO,EMSAO: Fix rcomp() declaration error in xcplot.c and emplot.c
EMSAO: Make sure all displays of z or 1+z are labelled correctly
SUMSPEC: Always set BCV to 0.0; it is always corrected for.

2.4.7 December 9, 2005
EQWIDTH: Fix bug when computing flux with fit continuum
XCSAO,EMSAO:  Force renormalization if -1 < spectrum < 1, not if max < 1
getimage.x: Do not append aperture to name if =0

2.4.6 August 22, 2005
XCSAO,EMSAO: Print ZXC, ZEM, and Z in header

2.4.5 July 28, 2005
EQWIDTH: Print multiple output streams; print zeroes if no flux or offscale.

2.4.4 July 14, 2005
EMSAO: Fix two erroneous calls to mfree() which worked OK in Solaris, not Linux

2.4.3 May 25, 2005
EMSAO: Add mode 11 to print line shifts in pixels
EMSAO: Print 3 decimal places in modes 3, 6, 9, 11
EMSAO,XCSAO,SUMSPEC: Add pixshift argument to rebin() and rebinl() for
calibration adjustments and compute needed wavelength vectors
rebin.x: Add pixshift argument to adjust calibration in rebin() and rebinl()
wlcon.x: Add wcs_pixshift() and wcs_getshift() and pixel shift in conversions

2.4.2 March 25, 2005
SUMSPEC: Add constant graph scaling

2.4.1 March 16, 2005
BCVCORR: Fix bug so decimal RA's are correctly converted to hours
compbcv.c: Fix bug so decimal RA's are correctly converted to hours

This is an *important* fix for anyone who cares about radial velocity
accuracy to better than 100 km/sec and has RA and DEC in decimal
degrees in their spectrum headers as the magnitude of the fix can be
over 40 km/sec.

2.4.0 February 23, 2005
EQWIDTH: Debug and add net flux and various possible ways to scale it
BCVCORR: Fix bug so keyword values for position and date can be used

2.3.9 October 19, 2004
EMSAO: Fix equivalent width computation so units match

2.3.8 September 28, 2004
EQWIDTH: Add 3 parameters--atrest, bypix, byexp--to output sky fluxes
at assumed rest wavelengths, normalized by exposure time and the number
of rows from which the signale was summed to be subtracted from an
extended object. (but program is still not tested)

2.3.7 August 25, 2004
SUMSPEC: use cont_remove instead of contout to remove continuum from input
spectra, fixing a bug
Fix lots of type mismatches using gcc-based compilers on Redhat Linux version.

2.3.6 July 20, 2004
XCSAO,EMSAO,QPLOT: If velocity is changed using 's', update spectrum header

2.3.5 June 16, 2004
XCSAO: + at start of emission line filename always labels emission lines
SUMSPEC: Add option fit to return fit to continuum rather than removing it
SUMSPEC: Add option to use a list of output files

2.3.4 January 16, 2004
Print nonspectral dispersion message only in debug mode in getimage()

2.3.3 August 1, 2003
Add ability to read first extension of multi-extension FITS file.
Eventually there will be new parameters, specext and tempext to
read ranges or lists of file extensions, but not yet.

2.3.2 June 2, 2003
Add smoothing of output spectrum to SUMSPEC.
Clean up BCVCORR so it actually handles all of its input options correctly. 

2.3.1 December 2, 2002
Fix bug in EMSAO renormalization check and boost renormalized spectra
so all pixels are positive in EMSAO.  Add min, max pixel in XCSAO if debug.

2.3.0 October 8, 2002
Add EQWIDTH task, based on IRAF noao.onedspec.sbands, to do photometry
on redshifted data at wavelengths specified in the rest frame.

2.2.9 September 17, 2002
Allocate large vectors only once

2.2.8 August 17, 2002
Add report mode 16 to XCSAO for per template wavelengths

2.2.7 May 29, 2002
Add per spectrum velocity shifts to SUMSPEC

2.2.6 March 29, 2002
Add per spectrum wavelength (or pixel) limits to SUMSPEC
Accept UTSTART as well as UTOPEN for observation beginning time

2.2.5 February 5, 2002
Ignore pixels with values less than MIN_PIXEL_VALUE at ends of spectra
Replace pixels with values less than MIN_PIXEL_VALUE elsewhere in spectra
In compbcv.x, allow use of new keywords OBS-LONG, OBS-LAT, and OBS-ELEV

2.2.4 September 19, 2001
Add 10th result reporting mode to EMSAO with line info only.
Drop SPECDIR from file name in headings
Fix units check in getimage()

2.2.3 July 31, 2001
Change cross-correlation velocity information in header when template
changed interactively in EMSAO and XCSAO using the 't' cursor command.
Fix pixel cross-correlation so it works.
Add option to ignore zeroed pixels in continuum fit and removal
Add option in SUMSPEC to remove continuum after rebinning (contout)
Add option in SUMSPEC to write each input file to a separate output file
 (composite file name is "")
Separate LINESPEC and SUMSPEC source directories from Makespec into
Linespec and Sumspec, with shared tasks into Util

2.2.2 April 3, 2001
Fix EMSAO and plotspec.x in several places to deal with right-to-left spectra.
Plot text info after spectrum in EMSAO so it all displays on xgterm.
Match arguments in SUMSPEC so renormalization works.

2.2.1 February 9, 2001
Fix bug in EMSAO so emission line structures are always initialized correctly
Fix bug in XCSAO to deal with right-to-left dispersion
Print aperture separately in XCSAO mode 12 report and EMSAO one-line reports

2.2.0 September 13, 2000
Add options to XCSAO to cross-correlate in wavelength and pixel space by
  changing the "correlate" parameter into a string.
Allow pixel or wavelength limits to be specified for templates in XCSAO so
 several pieces of a single template spectrum, such as emission lines, may
 be correlated against an object spectrum.
Add two new reporting modes to EMSAO, 8 to print wavelength information about
 fit emission lines on one line and 9 to print only wavelength shifts on one
 line.

2.1.27 August 10, 2000
Fix bug in EMSAO which caused problems with sorting during line search

2.1.26 August 2, 2000
Fix echelle mode spectrum number tracking.
Print file name and aperture as title for object and template graphs

2.1.25 July 21, 2000
In SUMSPEC, shift to first spectrum's barycentric velocity correction
if svel_corr is not none.

2.1.24 July 6, 2000
In LINESPEC and SUMSPEC, specify wavelength dispersion by 3 of start and
ending wavelength, wavelength/pixel, and number of pixels
Automatically renormalize if maximum spectrum value is less than one.
Clean up debugging code for renormalized cross-correlations.

2.1.23 June 8, 2000
Add equivalent width error to new report modes 0 and 7 in EMSAO

2.1.22 April 28, 2000
Change years from 0-120, not just 0-99, to 1900+year.  Some instrumentation
write 100 instead of 00 for 2000 in the old FITS format.

2.1.21 March 6, 2000
Fix bug in LINESPEC which caused wavelength to be multiplied 2+Z instead of 1+Z
if redshift was entered as Z instead of velocity.

2.1.20 January 25, 2000
Read SUBCONT flag in spectrum header to find out whether to subtract
continuum.  If T, remove continuum; if F, do not.  If it is not found,
remove continuum.

2.1.19 December 8, 1999
Free spectrum WCS when freeing image stops runaway memory use when looping
through large numbers of spectra in XCSAO, EMSAO, or SUMSPEC.
Fix bug in BCVCORR which failed to get image observatory name correctly.

2.1.18 September 24, 1999
Fix qplot mode of XCSAO to update best template information, including R
when a different best template is selected.

2.1b17 September 15, 1999
Fix tab table output in XCSAO (report_mode= -8, -10, -11, -12, or -14)

2.1b16 September 7, 1999
Write CD as well as CDELT in SUMSPEC.  Add gio.h dependencies in mkpkg.

2.1b15 August 24, 1999
Add vel_plot keyword to XCSAO and velplot keyword to QPLOT, so combination
velocity-redshifted lines can be displayed by default in dispmode > 0.
When continuum is divided out in SUMSPEC, the new continuum is 1.  A new
option for cont_remove, "divzero", divides by the continuum and subtracts
1 so the spectrum can be cross-correlated.  This is what "divide" did
in version 2.0 and all previous 2.1 betas, but it is not what you want
if you plan to compute equivalent widths.  Read templates from header
if NTEMP is set as well as if CZPARAMS is set.
 
2.1b14 July 29, 1999
Add tab table output option to XCSAO.  In SUMSPEC, copy entire header if
single file in and out, even if there are multiple spectra from that file.
In SUMSPEC, normalize by dividing out the mean times an input constant.
Add display with continuum subtracted to XCSAO.

2.1b13 July 23, 1999
Add tab table output option to EMSAO.  Replace blank fields with underscore.

2.1b12 July 16, 1999
Fix bug so QPLOT can update spectrum headers in both XCSAO and EMSAO.
If save_vel=yes and correlate or linefit =no the programs run in QPLOT
mode, where nothing will be wriitten unless new fits or correlations are done.

2.1b11 June 30, 1999
Fix bug in XCSAO which caused template heliocentric velocity correction and
header velocity to be ignored.  In debug mode, note which needed parameters
are missing when the heliocentric velocity correction cannot be computed.

2.1b10 June 25, 1999
Add display modes 4 and 5 in EMSAO and XCSAO to display spectrum with
continuum subtracted.  In EMSAO, add cursor commands to interactively
modify some continuum fit parameters:  C sets continuum fit parameters,
S sets the VELOCITY keyword.

2.1b9 June 15, 1999
Add option in sumspec to zero or fill parts of spectra known to be bad.
If they are zeroed, continuum is fit to an interpolated spectrum, and the
bad pixels are zeroed after the continuum is removed.
Fix fatal bug in linespec

2.1b8 May 21, 1999
Fix minor bug in filllist and change UT from end to start of observation
in juldate.x, adding UTEND to UTMID and UTOPEN as possibilities for computing
the Julian Date in conjunction with EXPOSURE or EXPTIME if the Julian Date
is not already ain the header as GJDN or MJD-OBS.
Try DATE keyword if DATE-OBS is not present

2.1b7 May 11, 1999
Fix bugs so that SUMSPEC can stack rebinned spectra

2.1b5 March 30, 1999

Search IRAF database for observatory position using OBSERVAT header keyword
if observatory position is not in the spectrum header, for computation of
the geocentric part of the barycentric velocity correction.

2.1b4 March 19, 1999

Fix logic in sumspec so multiple spectra are summed correctly.

2.1b3 March 18, 1999

Multiply by 1000 when renormalizing so that continuum is not less than 1
so S/N for line search in EMSAO and continuum removal in XCSAO and SUMSPEC
is a usable number.

2.1b2 March 12, 1999

Fix bug so that no error message is returned if an object spectrum file cannot
be opened READ_WRITE if it can be opened READ_ONLY and no writing is to be done.

2.1b1 December 30, 1998

Log normalization factor in SUMSPEC for first spectrum.  Fix bug in
XCSAO to properly deal with template spectrum lists with pathnames.

2.0 July 31, 1998

Add option to toggle header off in dispmode 3 summary display to
create figures with a line-labelled spectrum.

2.0b17 June 12, 1998

Limit analysis to pixels within limits specified by spectral WCS in header

2.0b16 May 22, 1998

2.0b15 May 15, 1998

Allow INDEF in minvel and maxvel.  Deal better with bad correlations.

2.0b14 April 22, 1998

Fix minor data type clashes.  Recode code which reads velocities from headers.
This version is probably the final beta before RVSAO 2.0, which is described
in a paper which has been accepted for publication in the August 1998 PASP.

2.0b12 April 7, 1998

Fix SUMSPEC bug which crashed the program when automatically finding
the wavelength overlap region.

2.0b11 March 4, 1998

Fix BCV calculation when no image is present

2.0b10 February 23, 1998

Fixed handling of velocities in object spectrum files.
Fixed handling of velocities in template spectrum files.
Fixed handling of barycentric velocity correction from files.
Allow up to 16384 points in correlations.
Set template velocity to 0.0 km/sec if there is no VELOCITY or APVELn
keyword in the header.

2.0b January 9, 1998

Precision problems have been fixed in the barycentric velocity correction.
The BCVCORR task has been added to deal with any observatory parameters
which might throw off the inline computation of the barycentric velocity
correction.
ISO date specification (yyyy-mm-dd) is now supported in header date keywords
as well as 1900-1999 standard FITS (dd/mm/yy).
The new SUMSPEC task creates spectra from multiple spectra taken at
different times.
The new LINESPEC task creates artificial spectra from lists of emission
and/or absorption lines.
The unsupported Fourier quotient task FQUOT has been dropped.
The option to divide by the continuum in XCSAO instead of subtracting it,
which is set by a template flag, DIVCONT, has been fixed. 
There are several new parameters in EMSAO:  MINCONT to determine whether
area or equivalent width is computed, LWMIN and LWMAX for the minimum and
maximum variation from the mean line width to be accepted, and LSMIN for
the minimum ratio of the equivalent width (or area) to its error for a
line to be accepted.
All intermediate plots, except those produced by IRAF's interactive curve
fitting routines during continuum fitting, have an added cursor command, h,
to eliminate headings and produce clean graphs for publication.
The parameters FIXBAD and BADLINES have been added to EMSAO, SUMSPEC, and
XCSAO to remove specified regions of a spectrum before processing.  A line
list is provided to remove the regions around night sky emission lines.
The parameters SPECBAND and TEMPBAND have been added to XCSAO, and SPECBAND
and SKYBAND to EMSAO, to make use of multiple bands in multispec data possible.
Because of all of these new parameters, users should run RELEARN on any
tasks they have used in the past.

***************************************************************************

1.9 December 5, 1995

Bugs fixed, but not a major release.

***************************************************************************

1.8 September 28, 1995

The major change is the ability to use either EMSAO and XCSAO to display
previous results saved in the image header.  XCSAO has two final displays,
the old one with both spectrum and correlation peak and complete per-
template correlation data, and the EMSAO display with emission and
absorption lines labelled.  A quality flag can be set in the header from
either final display in either XCSAO or EMSAO.  If no correlation is
done (correlation=no), only the final velocity information is rewritten
by XCSAO.  If no new line fit is done (linefit=no), EMSAO writes out
only the final velocity information, not overwriting the per-line results.
A new task, QPLOT, was added to check redshift results after batch runs.
There were also many minor bug fixes.

***************************************************************************

1.7 June 1, 1995 

Add continuum removal, explicit emission and rejection limits, and
zero-padding as optional template header-parameter-directed operations.
The boolean zero_pad parameter was changed to the character zeropad to
allow zero-padding to be optionally controlled by the template spectrum
header parameter ZEROPAD. czinit, which was a yes or no boolean in
previous versions of RVSAO has turned into the character string vel_init
in RVSAO 1.7 to allow an initial velocity to be set from the czguess
parameter or from a previously-obtained correlation, emission, or combined
velocity in the header.  Parameters s_abs_reject, s_em_reject, t_abs_reject,
and t_em_reject have been moved to XCSAO from CONTPARS as they are used
to prepare spectra only for cross-correlation.

***************************************************************************

1.6 February 27, 1995 

Optionally display the same summary in XCSAO as EMSAO and allow template-
directed high-pass filtering in XCSAO so that narrow line templates, such
as those containing emission lines can be used.  To enable this option,
square-root cosine-bell filtering is now done to the object and template
spectrum transforms rather than cosine-bell filtering the correlation.

***************************************************************************

1.5 September 9, 1994 

This version writes more complete results from EMSAO and XCSAO to the
image header.  EMSAO gets larger emission line names and a parameter to
specify the dispersion error, as well as a new summary page. XCSAO adds
parameters to allow emission line chopping in XCSAO to be controlled by
image header parameters, allowing emission line templates to be used, and
adds optional zero-padding of transforms before cross-correlation to improve
errors. 

***************************************************************************

1.4 June 23, 1994 

Fixing many small bugs, this version was never released ouside of SAO. 

***************************************************************************

1.3 April 12, 1994

Improve handling of missing or unwriteable files, add a cursor option to
set peak search width in XCSAO, and improve cursor line selection in EMSAO.
Add and improve cursor commands in EMSAO and add spectrum editing in XCSAO.
Greatly improve handling of multispec files as both object and template
spectra.  Add ZVEL CL script to run both XCSAO and EMSAO on a file or list
of files.  Fix EMSAO line-finding bug.

***************************************************************************

1.2 December 3, 1993
Fix some bugs involving multispec header information and adds the multspec
spectrum number to all logs and graphs.

***************************************************************************

1.1 July 1, 1993
Implement the IRAF MWCS spectrum file format, so multispec files can be
processed.

***************************************************************************

1.02 February 16, 1993
Clean up the lesser-used XCSAO reporting modes.

***************************************************************************

1.01 February 10, 1993
Add an improved help file for EMSAO, including some hints on using cursor
mode and fix some bugs in cursor line identification.  The heliocentric
velocity correction is now correctly applied.  (Barycentric corrections from
the image file header value have always worked.)

***************************************************************************

1.00 January 13, 1993
Clean up a few bugs and change the emlines.dat file to include an additional
entry for each line containing the half-width in angstroms of the region to
included in the fit for that line.  Some emission lines are not good
Gaussians, so a narrow fit near the peak gets a better center than an attempt
to fit the entire line to a Gaussian profile.  FQUOT no longer crashes.

***************************************************************************

0.99 August 12, 1992
Clean up multispec handling and fix some bugs in the cursor interaction
section of EMSAO, especially with regards to line ID.  A variety of bugs
have been fixed in the way velocity results are saved and combined
velocities computed for archive files and image headers.

***************************************************************************

0.98
Improve multispec capabilities, adding three new parameters to XCSAO:
	specnum, a list of spectra in a multispec file to be correlated,
	tempnum, a list of spectra in a multispec file to be used as templates
	echelle, which is set to "yes" if the spectrum and template are both
	         multispec echelle files--the same list, specnum, is used.
The maxshift and minshift parameters are now in km/sec, instead of pixels
in Fourier space, which should make appropriate values more obvious.
The following parameters have been added to EMSAO:
	specnum, a list of spectra to process from a multispec file,
	tempnum, a list of corresponding sky spectra in the multispec file,
	emlines, a file containing a list of emission lines,
	emcombine, a file containing a list of combined emission lines,
	npfit, the number of pixels to fit around each line peak,
	npcont, the number of pixels to fit around each line continuum,
	wspan, the wavelength to search around each redshifted line center,
	ablines, a file containing a list of absorption lines to label,
	emsearch, a file containing a list of the strongest emission lines.
Local modifications of the line lists is now possible without changing the
program, and changes to the parameters of the line fits allow use of EMSAO
on a wide range of types of spectra.

***************************************************************************

0.97
Add multispec reading capability.

***************************************************************************

0.96
Add correct parameters for FQUOT and fix a bug in pkwidth which would
cause XCSAO to bomb if a number of points rather than a peak fraction
to fit was specified.

***************************************************************************

0.95
Properly remove emission lines if IRAF continuum fitting is chosen and
correct several argument mismatches in subroutine calls.  EMSAO no longer
gives emission line centers that are one pixel off.

***************************************************************************