NAME

       mPutHdr - Replace a FITS image's header with one from an ASCII header template

SYNOPSIS

       mPutHdr [-d level] [-s statusfile] [-h hdu] in.fits out.fits hdr.template

DESCRIPTION

       Replaces the header of the input file with one supplied by the user.

OPTIONS

       -d     Turns on debugging to the specified level (this version only supports level "1").

       -s statusfile
              Output and errors are sent to statusfile instead of to stdout

       -h hdu Write to the specified FITS extnension (HDU).

ARGUMENTS

       in.fits
              Input FITS file.

       out.fits
              Path to output FITS file (with new header)

       hdr.template
              ASCII header template to write into out.fits.

RESULT

       [struct stat="OK"]

       Creates  FITS  file out.fits which contains the same data as in.fits, but has the contents
       of template.hdr  as  its  header  in  the  specified  extension  (default  0,  or  primary
       extension).   numlines  is  the  number  of  FITS  header  lines found in the input header
       template.

MESSAGES

       OK     [struct stat="OK"]

       ERROR  Cannot open status file: statusfile

       ERROR  HDU value (hdu) must be a non-negative integer

       ERROR  Not enough memory for output data image array.

       ERROR  Input wcsinit() failed.

       ERROR  FITS library error

EXAMPLES

       After running mGetHdr to write the contents of a FITS header to a file, we can  edit  that
       file  to  make  corrections  (remove  extraneous lines, add HISTORY lines, etc).  Then, to
       write a file with the fixed header:

       $ mPutHdr acs.fits acs_out.fits acs_fixed.hdr
              [struct stat="OK"]

BUGS

       The drizzle algorithm has been implemented but has not been tested in this release.

       If a header template contains  carriage  returns  (i.e.,  created/modified  on  a  Windows
       machine),  the cfitsio library will be unable to read it properly, resulting in the error:
       [struct stat="ERROR", status=207, msg="illegal character in keyword"]

       It is best for the background correction algorithms if the area described  in  the  header
       template  completely encloses all of the input images in their entirety. If parts of input
       images are "chopped off" by  the  header  template,  the  background  correction  will  be
       affected.  We  recommend  you  use  an expanded header for the reprojection and background
       modeling steps, returning to the originally desired header size for the final  coaddition.
       The default background matching assumes that there are no non-linear background variations
       in the individual images (and therefore in the  overlap  differences).  If  there  is  any
       uncertainty  in  this  regard, it is safer to turn on the "level only" background matching
       (the "-l" flag in mBgModel.

COPYRIGHT

       2001-2015 California Institute of Technology, Pasadena, California

       If your research  uses  Montage,  please  include  the  following  acknowledgement:  "This
       research  made use of Montage. It is funded by the National Science Foundation under Grant
       Number ACI-1440620, and was previously  funded  by  the  National  Aeronautics  and  Space
       Administration's  Earth Science Technology Office, Computation Technologies Project, under
       Cooperative Agreement Number  NCC5-626  between  NASA  and  the  California  Institute  of
       Technology."

       The  Montage  distribution  includes an adaptation of the MOPEX algorithm developed at the
       Spitzer Science Center.