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(gnuplot.info)boxerrorbars

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 The `boxerrorbars` style is only relevant to 2-d data plotting.  It is a
 combination of the `boxes` (Note: boxes ) and  `yerrorbars`
 (Note: yerrorbars ) styles.  The boxwidth will come from the fourth column
 if the y errors are in the form of "ydelta" and the boxwidth was not
 previously set equal to -2.0 (`set boxwidth -2.0`) or from the fifth column if
 the y errors are in the form of "ylow yhigh".  The special case  `boxwidth =
 -2.0` is for four-column data with y errors in the form "ylow yhigh".  In this
 case the boxwidth will be calculated so that each box touches the adjacent
 boxes.  The width will also be calculated in cases where three-column data are
 used.

 The box height is determined from the y error in the same way as it is for
 the `yerrorbars` style---either from y-ydelta to y+ydelta or from ylow to
 yhigh, depending on how many data columns are provided.