SLAPY3  -  return sqrt(x**2+y**2+z**2), taking care not to
       cause unnecessary overflow


SYNOPSIS

       REAL FUNCTION SLAPY3( X, Y, Z )

           REAL      X, Y, Z


PURPOSE

       SLAPY3 returns sqrt(x**2+y**2+z**2), taking  care  not  to
       cause unnecessary overflow.


ARGUMENTS

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


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