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slapy3

 NAME
      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.