simple contour plot displays the various depths of a lake. The dimensions
of the lake are plotted on the x and y axes. The z variable is plotted
as the third dimension, as levels represented by contour lines. The contour
line levels are displayed and labeled in the legend.
goptions reset=all border;
title "Lake Data";
footnote j=r "GCTLAKE";
proc gcontour data=sashelp.lake;
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