FIT\VISUALIZE [N] [/PEN [i]]
Plot the current fitted profile. The Nth line obtained the last time
MINIMIZE was executed, or recovered by DISPLAY, is plotted on the
screen. If N is 0, the sum of all lines is plotted, and if N is not giv-
en, the last value of N is used.
/PEN [ipen]: if ipen is present, use the given pencil 'ipen' prop-
erties (defined with "pen ipen"), otherwise use the last defined pencil.
Without option, use pencil 2 properties.