pnspec

          read an EPIC pn SciSim FITS file (generated by running
          podf on the output of SciSim), reconstruct the split
          events, and return the correct EPIC pn spectrum

          IAAT XMM Tools

          readpn,spectrum,rawspectrum=rawspectrum,auxfile=auxfile, $
          pnfile=pnfile,chatty=chatty,exposure=exposure

          auxfile: file containing the auxilliary information (usually
                   called pn_aux.fits
          pnfile : file containing the CCD events (e.g.,
                    pn_ccd1.fits)

          chatty : if set, give some debugging information
          nosplitcorr : if set, no split-event correction is performed
          timemode : if set, the simulation used the Timingmode,
                     default is the imaging mode.

          spectrum: the binned spectrum (photons/channel)

          rawspectrum: the binned spectrum, uncorrected for splits
          rawx: the x-coordinates of the events
          rawy: the y-coordinates of the events
          exposure: exposure time of the observation

          none

          * For the purpose of this subroutine, ``Split events'' are
            defined as all those events happening simultaneously (=in
            the same time frame) AND within 1 pixel to each other. No
            effort is taken to account for split events where more
            than two pixels contribute. Beware in the case of bright
            sources, where more than photon might get detected during
            the readout of one frame. These can look like splits

          Version 0.1, 1999/03/16, Joern Wilms
                                   (wilms@astro.uni-tuebingen.de)
                  0.11 1999/03/24, Ingo Kreykenbohm
                                   (kreyken@astro.uni-tuebingen.de)
                  0.12 1999/03/25, Joern Wilms, IK
                                    removed patch_broken_fits
                  0.13 1999/03/26, Ingo Kreykenbohm
                                   now TIMING mode works

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