.LP
Solid, dotted, dot-dash, short dash, long dash, and odd dashed line types are
available.  Use the "Line Type" toggle to select the type of plot you 
would like to display. If only one plot is displayed, that plot
will be immediately re-displayed in the new line 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 line type.   If some plots are hidden,
those plots will not appear in the list widget, as one may only change the
line type of a displayed plot, not one that is hidden.   Note: Polymarker and
Linemarker plots may NOT have their line types changed.  If a plot has had its
line type changed and is then changed to be of type Polymarker or Linemarker,
the line-type will be re-defined as Solid.
