plot_ratio

           plot residuum as a ratio

           cafe

           plot type

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

           Apart from IDL oplot keywords following special
           are defined:
          selected - Display selected datapoints only. Usefull
                     when fitting selected datapoints.
          distinct - Plot data for different subgroups in 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).

           ratio   - plots the quotient of data y-values and
                      model. This is: plot y/model_y
                      X range is kept, Y range is adapted to maximal values.
                     Do not use if some data/model values are negative.

           None.

           > plot, data, ratio
                -> data + ratio residuum is displayed.

           $Id: cafe_plot_ratio.pro,v 1.19 2004/07/30 17:17:26 goehler Exp $

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