plot_ybar

           plot y=const line for all existing data points, ignoring
           its y information.

           cafe

           plot type

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

           data     - plots the data of group given . X ranges are
                      kept. Undefined points are not plotted. No
                      error bars are drawn.

           Apart from IDL oplot keywords following special
                      are defined:
           norange  - Do not compute range (auxiliary data). Should
                      not be used if single plot type.
           yrange   - Range for displaying bar.
           distinct - Plot each subgroup file 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).

           Change plot.

           > plot, data+ybar:1
                -> add to data y bar lines from group 1

           $Id: cafe_plot_ybar.pro,v 1.5 2004/07/30 17:17:26 goehler Exp $

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