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<H3><A NAME="SECTION001243200000000000000"></A>
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4.4.3.2 Cartesian linear axes
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<P>
For non-geographic axes, the <B>BASEMAP_TYPE</B> setting is implicitly set to plain. Other than that,
cartesian linear axes are very similar to geographic axes. The annotation format may be controlled with
the <B>D_FORMAT</B> parameter. By default, it is set to ``%g'', which is a C language format statement
for floating point numbers<A NAME="tex2html1188"
HREF="footnode.html#foot19158"><SUP>4.7</SUP></A>,
and with this setting the various axis routines will automatically determine
how many decimal points should be used by inspecting the <I>stride</I> settings. If <B>D_FORMAT</B> is set
to another format it will be used directly (.e.g, ``%.2f'' for a fixed, two decimals format).
Note that for these axes you may use the <I>unit</I> setting to
add a unit string to each annotation (see Figure <A HREF="#fig:GMT_-B_linear">4.8</A>).
<P>
<DIV ALIGN="CENTER"><A NAME="fig:GMT_-B_linear"></A><A NAME="19490"></A>
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<CAPTION ALIGN="BOTTOM"><STRONG>Figure 4.8:</STRONG>
Linear Cartesian projection axis. Long tickmarks accompany
annotations, shorter ticks indicate frame interval. The axis label is
optional. We used <B>-R</B>0/12/0/1 <B>-JX</B>3/0.4
<B>-Ba</B>4<B>f</B>2<B>g</B>1:Frequency::,%:.</CAPTION>
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<ADDRESS>
Paul Wessel
2011-02-27
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