makearrow

           plot an arrow, pointing up, down, left, or right

           plotting

           makearrow,x,y, and one of the keywords

           x,y: position (in data-coordinates) where the tip of the arrow
                will be placed

          up,down,left,right: direction of the arrow
          color: color of the arrow
          size:  scaling-factor of the arrow
          xscale,yscale: individual scale for x and y extent of arrow
          thick: line thickness
          fill: Fill the arrows

          one of the keywords MUST be given

          trivial

         Version 0.5, 1997/06/23 Joern Wilms (wilms@astro.uni-tuebingen.de)
         Version 0.6, 1999/07/13 Joern Wilms
              (wilms@astro.uni-tuebingen.de)
         CVS Version 1.1, 2001.09.06: JW/SB, added xscale,yscale, and
             fill options

makedash

           makedash

           plot a dash, horizontal or vertical

           plotting

           makedash,x,y, and one of the keywords

           x,y: position (in data-coordinates) where the dash will be placed

          horizontal,vertical: direction of the dash
          color: color of the dash
          size:  scaling-factor of the dash (default: 1)

          one of the keywords MUST be given

          trivial

         Version 0.5, 1997/06/23 Joern Wilms (wilms@astro.uni-tuebingen.de)
         Version 0.6, 1999/07/13 Joern Wilms (wilms@astro.uni-tuebingen.de)

jwoploterr

             jwoploterr

             Overplot data-points with possible uncertainties in the
             X- and Y-direction to a pre-existing plot (in this sense
             the functionality is similar to oploterr). If the
             error-bars do not fit in the given x- or y-range,
             plot arrows.

             plotting

             jwoploterr,x,y,sig

             x: Array of X-values
             y: Array of Y-values
           sig: Array of Y-error-bars
                   if 2d: plus error is in sig[0,*], minus error in sig[1,*]

            dx: Array containing the width of the x-bins (from -dx to
                   +dx)
                if 2D: PLUS error is in dx[0,*], MINUS-err in dx[1,*]
      yerrrange: if set, then dy contains the confidence interval, not the
                 plus minuts errors
      xerrrange: dito, for dx
          psym: Psym to be used (default: 0)
       symsize: Symsize to be used (default: 1)
         color: color to be used (default: !p.color)
     ymin,ymax: min. and max. y-values of the plot (taken from !p.clip if
                not set)
     xmin,xmax: min. and max. x-values (ditto).
          size: Scaling-Factor for the arrows and dashes
       endmark: if set: draw a dash at the end of the error-bars
         thick: thickness of the lines
    xerr90to68: approximately convert 90% errors to 68% (1sigma)
                errors (x-axis)
    yerr90to68: approximately convert 90% errors to 68% (1sigma)
                errors (y-axis)

          a plot is created

          none; x-range is not yet implemented

          see procedure

          x=findgen(10)
          y=x*x
         dy=x
         jwoploterr,x,y,dy

         Version 0.5, 1997/06/23 Joern Wilms (wilms@astro.uni-tuebingen.de)
         Version 0.6, 1998/06/13 Joern Wilms: added endmark keyword
         Version 0.7, 1998/08/04 Joern Wilms: now allow for VERY
            large arrays by having the for-loop with i being a long.
         Version 0.8, 1999/01/15 Joern Wilms: deal with special case
            that x and y only contain one element
         Version 0.9, 1999/07/13 Joern Wilms: added thick keyword
         Version 0.91, 1999/07/13 Joern Wilms: added noarrow keyword
         Version 0.92, 1999/08/11 Joern Wilms: repaired embarrassing
            error when trying to plot unsymmetric error bars
         Version 0,93, 1999/08/13 Joern Wilms: Started implementing
            unsymmetrical x-errors
 $Log: jwoploterr.pro,v $
 Revision 1.5  2005/06/23 14:52:27  wilms
 added xerr90to68 and yerr90to68 keywords.
 Revision 1.4  2005/05/02 20:15:17  wilms
 added xerrrange and yerrrange keywords

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