PseudoGraphics uses the alternate
character set available on many terminals (or else standard ASCII
characters) to quickly draw a low-resolution version of the plot,
with axes, range settings and points. The
v command erases the video screen and draws a bare-
bones display of your plot. The values of the tick numbers and
the positions of the major tick marks are
shown. However, the symbol, text and most plot-
formatting features available using the plotter and filter
commands are not available with PseudoGraphics.