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<H2><A NAME="SECTION00365000000000000000">
1.6.5 The <B>-K</B> <B>-O</B> options</A>
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<DIV ALIGN="CENTER"><A NAME="fig:GMT_-H"></A><A NAME="fig:GMT_-OK"></A><A NAME="1687"></A>
<TABLE>
<CAPTION ALIGN="BOTTOM"><STRONG>Figure 1.10:</STRONG>
(left) Input files may have an arbitrary number of header records,
specified with <B>-H</B>.
(right) A final <I>PostScript</I> file consists of a stack of individual pieces</CAPTION>
<TR><TD><IMG
WIDTH="503" HEIGHT="232" BORDER="0"
SRC="img26.gif"
ALT="\begin{figure}\centering\begin{tabular}{cc}
\epsfig{figure=eps/GMT_-H.eps}& \epsfig{figure=eps/GMT_-OK.eps}\\
\end{tabular}\end{figure}"></TD></TR>
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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 <A HREF="node29.html#fig:GMT_-OK">1.10</A>). Thus,
when overlaying several <A NAME="tex2html117"
HREF="http://www.soest.hawaii.edu/gmt"><B>GMT</B></A> plots we must make sure that the first plot
call ommits 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 ommits 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.
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<ADDRESS>
Paul Wessel
2001-04-18
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