HELPLIB.HLB  —  FORTRAN  Intrinsic Procedures, SPACING
  SPACING (real-number)

  Class:  Elemental function - Generic

  Returns the absolute spacing of model numbers near the argument
  value.  The result type is the same as the argument.

  Example:

  If 3.0 is a REAL*4 value, SPACING (3.0) has the value 2**-22.
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