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<H2><A NAME="SECTION003241000000000000000">
O.4.1 Label placement by along-track distances, 1</A>
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<P>
This example will change the orientation of labels from along-track to across-track, and
surrounds the labels with an opaque, outlined textbox so that the label is more readable. We choose
the place the labels every 1000 km along the line and use that distance as the label. The
labels are placed normal to the line:
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<PRE>pscoast -R50/160/-15/15 -JM5.3i -Glightgray -A500 -K -P > GMT_App_O_6.ps
grdcontour geoid.grd -J -O -K -B20f10WSne -C10 -A20+d+s8 -Gl50/10S/160/10S -S10 \
-T:'-+' >> GMT_App_O_6.ps
psxy -R -J -O -SqD1000k:+g+LD+an+p -Wthick transect.d >> GMT_App_O_6.ps
</PRE>
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<DIV ALIGN="CENTER"><A NAME="fig:GMT_App_O_6"></A><A NAME="32964"></A>
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<CAPTION ALIGN="BOTTOM"><STRONG>Figure O.6:</STRONG>
Labels attributes are controlled with the arguments to the <B>-Sq</B> option.</CAPTION>
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The composite illustration in Figure <A HREF="#fig:GMT_App_O_6">O.6</A> shows the new effects. Note that
the line connecting the extrema does not end exactly at the `-' and `+' symbols. This is
because the placements of those symbols are based on the mean coordinates of the contour and
not the locations of the (local or global) extrema.
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<ADDRESS>
Paul Wessel
2010-01-14
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