cafegti

           Return good time interval for given data sets.

           CAFE

           AUXILIARY ROUTINE

           env      - The fit environment as defined in
                      cafeenv__define. Contains data to be
                      considered in gti expression.
           range    - Expression which defines range of data points to
                      return. Refer caferange procedure for complete
                      description.
           subgroup - Integer number defining the data set(s) (subgroup)
                      for which the gti is returned.
           group    - Integer number defining the data group for
                      which the gti is returned. Must be in 0..29.

           gaps     - Take time gaps into account which are defined
                      by non-evenly spacing in the x values of given
                      subgroups (each subgroup is treated
                      separately).
                      The gap is defined by deviation of regular
                      time steps (with bin width = x[1]-x[0] or bt)
                      exceeds the tolerance.

         tolerance - Parameter defining the lower limit for the gap
                     length; the reference is the time difference
                     between the first and second entry in the time
                     array; tolerance defines the maximum allowed
                     relative deviation from this reference bin
                     length; default: 1D-8.
          bt       - bin-time of the light curve (default:
                     bt=time[1]-time[0]).

           Returns 2-Dim good time  array defined as gti[2,*] with gti[0,*]
           are the start and gti[1,*] are the stop times.
           If no valid good time interval is found -1 is returned.

           The gti list is  sorted and no intervals should intersect.

           This procedure defines good time intervals (i.e. the range
           of valid data points) under following assumptions:
            1.) start and stop of each data set define the
                outer gti boundary.
            2.) ignored data points and data points not mentioned in
                range define inner gti boundaries.

           None.

           $Id: cafegti.pro,v 1.3 2004/09/27 21:29:52 goehler Exp $

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