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LAS\MODIFY PROJECTION Type [A0 D0 [Angle [DEG|RAD]]]
Change the projection system of the current R observation, and optional-
ly the projection center and angle at the same time. Type "MODIFY PRO-
JECTION ?" for a list of supported projections.
A0 and D0 should be sexagesimal strings in degrees, except A0 in hour
angle if coordinate system is Equatorial. Angle is the desired projec-
tion angle, with its unit given just after (default degrees).
If an argument is absent or equal sign "=", it is left unchanged. The
offsets are recomputed consistently according to the modified parame-