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The required argument controls the placement of labels along the quoted
lines. Choose among five controlling algorithms:
**d**\ *dist*\ [**c**\ \|\ **i**\ \|\ **p**] or **D**\ *dist*\ [**d**\ \|\ **e**\ \|\ **f**\ \|\ **k**\ \|\ **m**\ \|\ **M**\ \|\ **n**\ \|\ **s**]
For lower case **d**, give distances between labels on the plot
in your preferred measurement unit **c** (cm), **i** (inch), or
**p** (points), while for upper case **D**, specify distances in
map units and append the unit; choose among **e** (m), **f**
(foot), **k** (km), **M** (mile), **n** (nautical mile) or **u**
(US survey foot), and **d** (arc degree), **m** (arc minute), or
**s** (arc second). [Default is 10\ **c** or 4\ **i**]. As an
option, you can append /*fraction* which is used to place the
very first label for each contour when the cumulative
along-contour distance equals *fraction \* dist* [0.25].
**f**\ *ffile.d*
Reads the ASCII file *ffile.d* and places labels at locations in
the file that matches locations along the quoted lines. Inexact
matches and points outside the region are skipped.
**l\|L**\ *line1*\ [,\ *line2*,...]
Give *start* and *stop* coordinates for one or more
comma-separated straight line segments. Labels will be placed
where these lines intersect the quoted lines. The format of each
*line* specification is *start/stop*, where *start* and *stop*
are either a specified point *lon/lat* or a 2-character **XY**
key that uses the justification format employed in **pstext** to
indicate a point on the map, given as [LCR][BMT].
In addition, you can use Z-, Z+ to mean the global minimum and
maximum locations in the grid. **L** will interpret the point pairs
as defining great circles [Default is straight line].
**n**\ *n\_label*
Specifies the number of equidistant labels for quoted lines line
[1]. Upper case **N** starts labeling exactly at the start of
the line [Default centers them along the line]. **N**-1 places
one justified label at start, while **N**\ +1 places one
justified label at the end of quoted lines. Optionally, append
/*min\_dist*\ [**c**\ \|\ **i**\ \|\ **p**] to enforce that a
minimum distance separation between successive labels is
enforced.
**x\|X**\ *xfile.d*
Reads the multisegment file *xfile.d* and places labels at the
intersections between the quoted lines and the lines in
*xfile.d*. **X** will resample the lines first along
great-circle arcs.
In addition, you may optionally append
**+r**\ *radius*\ [**c**\ \|\ **i**\ \|\ **p**] to set a minimum
label separation in the x-y plane [no limitation].
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