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.
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