.LP
15 different Marker types are available for use with scatter plots.
Use the "Marker Type" toggle to select the type of marker you would like
to display.  If only one plot is displayed, that plot will be immediately 
re-displayed with the new marker type. If more than one plot is displayed, 
a list widget will come up so that one may select which plot(s) should be 
changed to the new marker type.   If some plots are hidden, those plots 
will not appear in the list widget, as one may only change the marker type 
of a displayed plot, not one that is hidden.  Note:  ONLY Scatter plots may 
have their marker types changed.  If the displayed plots 
are not a scatter plot, an error message will be displayed. 
