If you specify more than one legend with the same position, then all of
your legends are placed at that position.
SORTORDER=ASCENDING | DESCENDING
specifies the sort order to use for the legend entry labels.
TITLE="text-sting"
specifies the label for the legend. By default, the label of the group variable is
used.
MARKERATTRS=style-element <(options)> | (options)
specifies the appearance of the markers in the plot. You can specify the appearance
by using a style element or by specifying specific options. If you specify a style
element, ...
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