set arrscl size <magnitude>
Specifies arrow length scaling.
size is
the length of the
arrow in plotting
units (inches on the virtual page). A typical value would be
0.5 to 1.0.
magnitude is the vector
magnitude that will
produce an arrow of the specified size.
Other arrow lengths will be scaled appropriately. If
magnitude is not given, all the arrows will be the
same length. Reset by clear or
display.