Click here to see the SAS code.
Click here to see the example.
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These graphs are similar to the ones Hadley Wickham creates
with ggplot2 in the R language.
The 'trick' here is to get nice smooth-edged plot markers,
using an anti-aliased truetype font character rather than
the gplot 'dot' marker. And also to make the plot markers
in the legend a bit larger than default.
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