.LP
15 different Marker types are available for use as Polymarkers & Linemarkers.
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 Polymarker or 
Linemarker plots may have their marker types changed.  If the plots displayed 
are not of either of these types, an error message will be displayed. 
