Deletes the NOM keywords
The asp_offaxis_corr tool removes the RA_NOM, DEC_NOM, and ROLL_NOM keywords from the header of the aspect solution file. These keywords are used by some applications, such as marx.
Workaround:
To work around the problem, users can copy the *PNT keyword values to the *NOM values. For example:
bash$ for key in RA DEC ROLL
do
  val=`dmkeypar pcad.fits ${key}_PNT echo+
  dmhedit pcad.fits file= op=add key=${key}_NOM value=$val 
done
# - or - 
tcsh% foreach key (RA DEC ROLL)
  set val=`dmkeypar pcad.fits ${key}_PNT echo+
  dmhedit pcad.fits file= op=add key=${key}_NOM value=$val 
end