Click here to see the SAS code.
Click here to see the example.

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I use a sas/graph gplot to set up the axes & coordinate system.
But I basically suppress everything else about the gplot (axes, etc).

The markers are custom sas/graph annotate.  I use the sas/graph 'marker'
software font to do the left/right/up/down trend arrows, and the round
dot in the middle of the arrow.  This is all data-driven, via the data
in the dataset.

The colored areas and the labels for the areas are sas/graph annotate,
and are driven by values in macro variables. 

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