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include "fitsio.h"
procedure fssnul(ounit,colnum,nulval,status)
# ascii table Column NULl value definition
# Define the null value for an ASCII table column.
int ounit # i output file pointer
int colnum # i column number
char nulval # i value for undefined pixels
% character*16 fnulva
int status # o error status
begin
call f77pak(nulval,fnulva,16)
call ftsnul(ounit,colnum,fnulva,status)
end
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