Algorithm

subroutine omgprep

   open output file
   read the OSW window parameters, binning factors from header

   call CAL_GetBoresightMat
   call OAL_GetAttitude (with time of reference frame)

   find OM boresight direction
   undistort image
	
   rotate by the angle corresponding to the grism filter
   write out to a fits file.

   close OSWSL
   close output file

end subroutine  omgprep