gtiselect

           Plot the light curve and generate via interactive modus
           a gti file by defining non-gti time ranges.
            - left mouse key: zoom in/out
               +to zoom in:  press mouse key, move left,  release key.
               +to zoom out: press mouse key, move right, release key.
            - right mouse key: mark range that should NOT be used as gti.
               +to mark a range: press mouse key, move, release key.
               +to write the range into gti file click button without moving.
            - middle mouse key: write gti and leave program

           gti file generation

           gtiselect, 'filename'

          filename of lightcurve

          cleanbg: indicate certain background level [cts/sec] in the plot

          gti: name for output file
          nops: do not create postscript file

          gti file: gti.ds
          PS file: gtiselection_lightcurvefilename.ps

          gti file: name according to keyword gti

          gtiselect, 'lightcurce.lc' [,gti='gtifile.name', cleanbg=1.0, /nops]

          Version 1.1: created by Martin Stuhlinger
          Version 1.2: added keyword gti for gti file name
                       05.09.2001, Martin Stuhlinger
          Version 1.3: create PS file of light curve with marked gti intervals
                       and added keyword nops to prevent it.
                       16.05.2002, Martin Stuhlinger
          Version 1.4: find out whether table column inside the
                       lightcurve fits file is named "RATE" or
                       "COUNTS"
                        06.08.2002, Martin Stuhlinger
          Version 1.5: Bug fix: strmatch for TTYPE RATE is not any more
                       restricted to TTYPE1.
                       14.03.2003, Martin Stuhlinger
          Version 1.6: Changed structure of routine: sourced out
                       sort and plot tasks into internal procedures.
                       Zoom-out ranges are now equal to zoom-in ranges.
                       Indicate selected non-gti regions in interactive
                       plot.
                       Added keyword cleanbg.
                       26.05.2006, Martin Stuhlinger

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