EQPOLE

       Convert RA and Dec to X,Y using an equal-area polar projection.

       The output X and Y coordinates are scaled to be between
       -90 and +90 to go from equator to pole to equator. Output map points
       can be centered on the north pole or south pole.

       EQPOLE, L, B, X, Y, [ /SOUTHPOLE ]

       L - longitude - scalar or vector, in degrees
       B - latitude - same number of elements as RA, in degrees

       X - X coordinate, same number of elements as RA.   X is normalized to
               be between -90 and 90.
       Y - Y coordinate, same number of elements as DEC.  Y is normalized to
               be between -90 and 90.

       /SOUTHPOLE      - Keyword to indicate that the plot is to be centered
               on the south pole instead of the north pole.

       J. Bloch        LANL, SST-9     1.1     5/16/91
       Converted to IDL V5.0   W. Landsman   September 1997

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