C----------------------------------------------------------------------
        subroutine ftsrnn(value)

C       set a 32-bit pattern equal to an IEEE Not-a-Number value
C       A NaN has all the exponent bits=1, and the fractional part
C       not=0.  
C
C       written by Wm Pence, HEASARC/GSFC, June 1991

        integer value

C       there are many NaN values;  choose a simple one in which all bits=1
        value=-1
        end