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(gnuplot.info)xyerrorbars

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 The `xyerrorbars` style is only relevant to 2-d data plots.  `xyerrorbars` is
 like `dots` (Note: dots ), except that horizontal and vertical error bars
 are also drawn. At each point (x,y), lines are drawn from (x,y-ydelta) to
 (x,y+ydelta) and from (x-xdelta,y) to (x+xdelta,y) or from (x,ylow) to
 (x,yhigh) and from (xlow,y) to (xhigh,y), depending upon the number of data
 columns provided.  A tic mark is placed at the ends of the error bar (unless
 `set bar` (Note: bar ) is used---see `set bar` for details).

 If data are provided in an unsupported mixed form, the `using`
 (Note: using ) filter on the `plot` (Note: plot ) command should be used
 to set up the appropriate form.  For example, if the data are of the form
 (x,y,xdelta,ylow,yhigh), then you can use

       plot 'data' using 1:2:($1-$3),($1+$3),4,5 with xyerrorbars