plot_delchi

           plot residuum in 1-sigma units

           cafe

           plot type

           group    - (optional) Define the data group to plot.
                      Default is the current group. Must be in
                      range [0..29].

           delchi   - plots the difference between data y-values and
                      model, in units of 1 sigma. This is: plot (y -
                      model_y)/error
                      X range is kept, Y range is adapted to maximal values.

           Apart from IDL oplot keywords following special
           are defined:
           noerror  - Do not plot error bars. This is useful for
                      tight data sets.
           selected - Define range from selected datapoints. Usefull
                      when fitting selected datapoints only.
           distinct - Plot each subgroup with a different color.
        deltacolor  - Color difference for distinct data sets.
     deltalinestyle - Increase of line styles for distinct data
                      sets. Default: 0 (no change).
          deltapsym - Increase of point symbols for distinct data
                      sets. May be positive or negative
                      integer number. Default: 0 (no change).
                      If psym exceeds -7..7 it will be set at 0 (no
                      symbol). Therefore it is recomended to
                      plot data sets with lines with a negative
                      deltapsym (to decrease and restart from 0).

           None.

           > plot, data, delchi
                -> data + residuum of chi is displayed.

           $Id: cafe_plot_delchi.pro,v 1.20 2004/07/30 17:17:26 goehler Exp $

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