4.2. - v draw PseudoGraphics plot
uses the alternate characters 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.
vThe
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 as they will appear on the plot.
However, symbol, text and most other formatting features described
in Chapters 5 and 6 are not available with PseudoGraphics.