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<H2><A NAME="SECTION001246000000000000000">
4.4.6 Plot overlays: The <B>-K</B> <B>-O</B> options</A>
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<P>

<DIV ALIGN="CENTER"><A NAME="fig:GMT_-OK"></A><A NAME="19133"></A>
<TABLE>
<CAPTION ALIGN="BOTTOM"><STRONG>Figure 4.19:</STRONG>
A final <I>PostScript</I> file consists of any number of individual pieces.</CAPTION>
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 WIDTH="670" HEIGHT="271" ALIGN="BOTTOM" BORDER="0"
 SRC="img62.png"
 ALT="\includegraphics{scripts/GMT_-OK}"></DIV></TD></TR>
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<P>
The <B>-K</B> and <B>-O</B> options control the generation of <I>PostScript</I> code for multiple
overlay plots.  All <I>PostScript</I> files must have a header (for initializations),
a body (drawing the figure), and a trailer (printing it out) (see
Figure&nbsp;<A HREF="#fig:GMT_-OK">4.19</A>).  Thus,
when overlaying several <A NAME="tex2html1135"
  HREF="http://gmt.soest.hawaii.edu"><B>GMT</B></A> plots we must make sure that the first plot
call omits the trailer, that all intermediate calls omit both header and
trailer, and that the final overlay omits the header.
<B>-K</B> omits the trailer which implies that more <I>PostScript</I> code will be appended
later [Default terminates the plot system].  <B>-O</B> selects Overlay plot
mode and omits the header information [Default initializes a new plot system].
Most unexpected results for multiple overlay plots can be traced to the
incorrect use of these options.  If you run only one plot
program, ignore both the <B>-O</B> and <B>-K</B> options; they are
only used when stacking plots. 

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<ADDRESS>
Paul Wessel
2010-07-14
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