IS CLOCKWISE LOOKING OUTWARD FROM THE CENTER OF THE 
STRUCTURE. ROTATIONS ARE ALWAYS IN DEGREES. 

After completing one of the operations, you are returned to the rotation sub-
menu [E]: exit to the main menu with ESC, then call option [D]-Replot if no 
other operations are desired. 

[E.1] ROTATE ON CARTESIAN AXES 

This rotates the structure on one of two sets of cartesian axes. If 
orthographic viewing is OFF, the structure is rotated about one of the a