IS_IEEE_BIG

       Determine if the current machine uses IEEE, big-endian numbers.

       (Big endian implies that byteorder XDR conversions are no-ops).

       flag = is_ieee_big()

       None

       1 if the machine appears to be IEEE-compliant, 0 if not.

       None.

       None

       The first byte of the two-byte representation of 1 is examined.
       If it is zero, then the data is stored in big-endian order.

       Written 15-April-1996 by T. McGlynn for use in MRDFITS.
       13-jul-1997     jkf/acc - added calls to check_math to avoid
                                 underflow messages in V5.0 on Win32 (NT).
       Converted to IDL V5.0   W. Landsman   September 1997
       Follow RSI and just do a single test  W. Landsman   April 2003

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