writepha

           Write photon-spectrum as an OGIP-compatible FITS-PHA-File in the
           Format defined in OGIP memo CAL-GEN 92-007 and 92-007a

           High-Energy Astrophysics

           writepha,count,counterr,phafile

          count     : counts in bin or countrate (see cps keyword)
          counterr  : uncertainty of count (ignored when poisson set)
          phafile   : filename of pha-file

          none

          response  : filename of response-matrix (default: none)
          telescope : ID of telescope (default: unknown)
          instrument: ID of instrument
          object    : name of observed object
          ra,dec    : position of observed object (degrees!), implies:
          equinox   :    equinox os coordinate
          radecsys  :    coordinate-frame used
          date_obs  : start-time string (dd/mm/yy), UTC, implies
          time_obs  :    start-time (hh:mm:ss), UTC
          date_end  :    end-time (dd/mm/yy), UTC
          time_end  :    end-time (hh:mm:ss), UTC
          jdobs     : Julian Date of start of observation, implies
          jdend     :    JD of end of observation
          filter    : filter used (default: none)
          exposure  : exposure time (default: 1.
          backfile  : filename of background-spectrum (default: none)
          backscale : scale-factor of background-spectrum (default: 1)
          corrfile  : filename of correction-file (default: none)
          corrscale : scale-factor of corrfile (default: 1)
          effarea   : Area scaling factor (default: 1.)
          cps       : if set,spectrum is in counts per second
                      (default: total counts per bin)
          poisson   : if set, assume Poisson-Statistics (and don't use
                      uncertainty of spectrum); not possible if cps is
                      used. Implies that counterr will NOT be used!
          staterr   : systematic statistical error (default: 0,
                      i.e. none)
          pi        : if set, data are pulse invariant data (default
                      if not set: data are pulse height analyzer data; PHA)
          arf       : filename of ancillary file (i.e. effect. area)
          origin    : institution where file originates from
          total     : if set, spectrum is source+bk (default)
          background: if set, spectrum is background-spectrum
          net       : if set, spectrum is background-subtracted
          startchan : first channel of spectrum (1 by default)
          group     : array of same size as count and counterr defining
                      the grouping of the data (see grppha
                      procedure). a "1" starts a new group, -1 is the
                      continuation of the rebinned channel
          quality   : array same size as count, a 0 designates a good
                      channel, <>0 is bad (2: marked bad by rebinning)

          none

          none

          none

          The PHA-File gets written to disk

          * The error-handling really isn't as good as is should be yet.
          * NOTE THAT MULTIPLE DATA SETS ARE NOT ALLOWED YET
          * Do not have both, date_obs and jdobs!!!!

          see code

          STILL MISSING

       written in 1995 and 1996 by Joern Wilms,
               wilms@astro.uni-tuebingen.de
       Version 1.0: 1997/02/14  "Official" release
       Version 1.1: 1997/06/25, JW
           Corrected typo in HDUCLAS2 statement
       Version 1.2: 1997/10/22, JW
           allow for non-integer counts even in the non-cps case
           (e.g. background-models etc.)
       Version 1.3: 1998/01/28, JW
           allow case when counterr is not given but Poisson is
           set (i.e. poisson leads to ignoring counterr)
       Version 1.4: 1999/03/17, JW
           added TLMIN and TLMAX keywords to be fully compatible with
           OGIP memo 92-007a; made compatible with IDL 5.x
   CVS VERSION 1.2: 2001/03/15, JW
           added capability to write grouped spectra and to set
           the quality of channels
       Version 1.3: 2001/03/21, JW
           added PI keyword, added docu to group and quality keywords
       Version 1.4: 2001/03/21, JW
           stupid bug in CHANTYPE keyword -- remember, always check
           your trivial code before checking it in...

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