This option has no effect unless CURVELABEL is also specified.
GROUP=variable
specifies a variable that is used to group the data. A separate plot is created for each
unique value of the grouping variable. The plot elements for each group value are
automatically distinguished by different visual attributes.
LEGENDLABEL=“text-string”
specifies a label that identifies the plot in the legend. By default, the label
“LineParm” is used (if you specify a numeric value for Y) or the Y variable name is
used (if you specify a variable for Y).
Interaction
The LEGENDLABEL= option has no effect if you also specify the
GROUP= option in the same plot ...
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