VECKEY sets where the scaling key for the vectors is plotted. See VECTOR and VECSET commands.
x = x position of vector key
y = y position of vector key (default is no key at all)
ipos = relative position of key (not implemented)
format = format to draw the numeric part of the key default = (1pg10.3)
Valid qualifiers are:
/[NO]USER determines units of x and y positions. Default is /USER. If /NOUSER units are inches from the ORIGIN. (see the ORIGIN command)