4.3. - va draw PseudoGraphics axes
draws the plot axes without displaying points.
vaThe plot axes will be drawn with ranges set according to the
ra, ro or
np commands.
The screen is not erased before the
axes are drawn, and the cursor is put in the upper-left corner of
the screen after the axes are drawn.
This command is the quickest
way to see how the axes will appear on the final plot.