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<H2><A NAME="SECTION001711000000000000000"></A>
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B.1.1 ASCII tables
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<P>
The first data record may be preceded by 1 or more header records.
When using such files, make sure to use the <B>-H</B> option and set
the parameter N_HEADER_RECS in the <U>.gmtdefaults</U> file
(System default is 1 header record if <B>-H</B> is set; you may also
use <B>-H</B><I>nrecs</I> directly). Fields
within a record must be separated by spaces, tabs, or commas.
Each field can be an integer or floating-point number or a geographic
coordinate string using the [+<IMG
WIDTH="8" HEIGHT="31" ALIGN="MIDDLE" BORDER="0"
SRC="img21.gif"
ALT="$\vert$">-]dd[:mm[:ss]][W<IMG
WIDTH="8" HEIGHT="31" ALIGN="MIDDLE" BORDER="0"
SRC="img21.gif"
ALT="$\vert$">S<IMG
WIDTH="8" HEIGHT="31" ALIGN="MIDDLE" BORDER="0"
SRC="img21.gif"
ALT="$\vert$">N<IMG
WIDTH="8" HEIGHT="31" ALIGN="MIDDLE" BORDER="0"
SRC="img21.gif"
ALT="$\vert$">E<IMG
WIDTH="8" HEIGHT="31" ALIGN="MIDDLE" BORDER="0"
SRC="img21.gif"
ALT="$\vert$">w<IMG
WIDTH="8" HEIGHT="31" ALIGN="MIDDLE" BORDER="0"
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ALT="$\vert$">s<IMG
WIDTH="8" HEIGHT="31" ALIGN="MIDDLE" BORDER="0"
SRC="img21.gif"
ALT="$\vert$">n<IMG
WIDTH="8" HEIGHT="31" ALIGN="MIDDLE" BORDER="0"
SRC="img21.gif"
ALT="$\vert$">e] format.
Thus, 12:30:44.5W, 17.5S, 1:00:05, and 200:45E are all valid input strings.
When dealing with time- or (<I>x,y</I>)-series it is usually
convenient to have each profile in separate files.
However, this may sometimes prove impractical due to large numbers
of profiles. An example is files of digitized lineations where
the number of individual features may range into the thousands.
One file per feature would in this case be unreasonable and
furthermore clog up the directory. <A NAME="tex2html572"
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keeping more than one profile in a file. Such files are called
<I>multiple segment files</I> and are identical to the ones
just outlined except that they have subheaders interspersed with
data records that signal the start of a segment.
The subheaders may be of any format, but all must have the same
character in the first column. When using such files, you must
specify the <B>-M</B> option. The unique character is by default
'<IMG
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ALT="$>$">', but you can override that by appending your chosen character
to the M option. E.g., <B>-MH</B> will look for subheaders starting
with H, whereas <B>-M'*'</B> will check for asterisks (The quotes
are necessary since * has special meaning to <I>UNIX</I>). The subheaders
may contain <B>-W</B> and <B>-G</B> options for specifying pen and
fill attributes for individual segments. These settings will override
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<ADDRESS>
Paul Wessel
2001-04-18
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