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+C--------------------------------------------------------------------------
+ subroutine ftukyf(ounit,keywrd,rval,decim,comm,status)
+
+C update a real*4 value header record in F format
+C
+C ounit i fortran output unit number
+C keywrd c keyword name ( 8 characters, cols. 1- 8)
+C rval r keyword value
+C decim i number of decimal places to display in value field
+C comm c keyword comment (47 characters, cols. 34-80)
+C OUTPUT PARAMETERS:
+C status i output error status (0 = ok)
+C
+C written by Wm Pence, HEASARC/GSFC, Oct 1994
+
+ character*(*) keywrd,comm
+ real rval
+ integer ounit,status,decim,tstat
+
+ if (status .gt. 0)return
+ tstat=status
+
+C try modifying the keyword, if it exists
+ call ftmkyf(ounit,keywrd,rval,decim,comm,status)
+
+ if (status .eq. 202)then
+C keyword doesn't exist, so create it
+ status=tstat
+ call ftpkyf(ounit,keywrd,rval,decim,comm,status)
+ end if
+ end