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<H2><A NAME="SECTION00342000000000000000"></A>
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1.4.2 Logarithmic projection
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<P>
We next will show how to do a basemap for a log-log plot. We will
assume that the raw <I>x</I> data range from 3 to 9613 and <I>y</I>
ranges from <!-- MATH
$3.2 \cdot 10^{20}$
-->
<IMG
WIDTH="62" HEIGHT="35" ALIGN="MIDDLE" BORDER="0"
SRC="img6.png"
ALT="$3.2 \cdot 10^{20}$"> to <!-- MATH
$6.8 \cdot 10^{24}$
-->
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WIDTH="62" HEIGHT="35" ALIGN="MIDDLE" BORDER="0"
SRC="img7.png"
ALT="$6.8 \cdot 10^{24}$">. One possibility is
<P>
<PRE>
psbasemap -R1/10000/1e20/1e25 -JX9il/6il \
-B2:"Wavelength (m)":/a1pf3:"Power (W)":WS > plot.ps
</PRE>
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(The backslash <IMG
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SRC="img8.png"
ALT="$\backslash$"> makes <I>UNIX</I> ignore the carriage return that follows and treat the two lines as one long command).
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<ADDRESS>
Paul Wessel
2010-01-14
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