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

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This is basically a simple sas/graph 'proc gplot' scatter plot, 
with a few 'extras' annotated.  

First I annotate the quadrant labels for the 3 areas of the
graph, in the x & y direction (note that the dashed lines are not
annotated - they're just regular-old gplot href= and vref= reflines).

Then, I annotate some 'tails' on the scatter plot markers, based on
the high and low values in the x & y direction, for the given time period.

For this example, all the data, and high/low values are hard-coded,
but this could be easily converted to calculating these values from 
actual data (I just didn't have any actual data, and it would have
been cumbersome to make-up plausibly real fake data for a long time
period :)

One other 'custom' thing in the graph - rather than using the built-in
sas/graph gplot marker symbols, I used the 'U' character of the sas/graph
'marker' software font, to make the square markers...

   symbol1 height=2 font=marker value='U' interpol=none r=2;


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