NAME

       mGetHdr - Retrieve the header from a FITS image

SYNOPSIS

       mGetHdr [-d] [-h hdu] [-s statusfile] img.fits img.hdr

DESCRIPTION

       Reads in the header from a FITS image and prints it out to a text file.

OPTIONS

       -d     Turns on debugging.

       -h hdu Retrieve  the  header  from  the  Fits  extension  given  by  hdu.  "0" indicates the primary FITS
              extension, and is the default used by mGetHdr.

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

ARGUMENTS

       img.fits
              Path to FITS image from which to retrieve the header.

       img.hdr
              Path to text file where FITS header should be written.

RESULT

       Creates output file img.hdr which is a text copy of the FITS header from the input image.

MESSAGES

       OK     [struct stat="OK", ncard=nrows]

       ERROR  Cannot open status file: statusfile

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

       ERROR  Can't open output header file.

       ERROR  FITS library error

EXAMPLES

       Running mGetHdr on a 2MASS Atlas image:

       $ mGetHdr 2mass.fits test.hdr
              [struct stat="OK", ncard=112]

       This creates the text file test.hdr.

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.