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CARG

       REAL FUNCTION  CARG (Z)
 C$    (Complex Argument)
 C$    Return the  argument,  THETA, of  the  complex number  Z  =
 C$    R*EXP(I*THETA) = X  + I*Y.   The function value  is in  the
 C$    range -pi..+pi.
 C$    (03-APR-82)