You can use the AUTOALIGN, LOCATION=, HALIGN=, and VALIGN= options to
place your legend. Note the following about legend placement:
•When a discrete legend is placed within the axis frame (LOCATION=INSIDE):
•It is always placed on top of plot lines and markers.
•Its background is fully transparent by default (OPAQUE=FALSE), meaning that
underlying lines, markers, and data labels will show through the legend.
•Its position is controlled with the AUTOALIGN= option.
•When a discrete legend is placed outside the axis frame (LOCATION=OUTSIDE):
•Its background is fully opaque by default ...
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