SLAPY2  - return sqrt(x**2+y**2), taking care not to cause
       unnecessary overflow


SYNOPSIS

       REAL FUNCTION SLAPY2( X, Y )

           REAL      X, Y


PURPOSE

       SLAPY2 returns sqrt(x**2+y**2), taking care not  to  cause
       unnecessary overflow.


ARGUMENTS

       X       (input) REAL
               Y        (input) REAL X and Y specify the values x
               and y.


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