GRAPH:REPLOT

example

 AUTOSCALE ON              ! turns on axis autoscaling
 SET PCHAR -1              ! set plotting character to `box'
 GRAPH X Y                 ! plot data with axes
 SET PCHAR -2              ! set plotting character to `cross'
 GRAPH\NOAXES U V          ! overlay another data curve
 CLEAR\NOREPLOT            ! clears graphics but not the replot buffers
 REPLOT                    ! replot both data sets on common scale