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The boxxyerrorbars style is only relevant to 2D data plotting. It is similar to the xyerrorbars style except that it draws rectangular areas rather than simple crosses. It uses either 4 or 6 basic columns of input data. Additional input columns may be used to provide information such as variable line or fill color (see ‘rgbcolor variable‘).
4 columns: x y xdelta ydelta 6 columns: x y xlow xhigh ylow yhigh
The box width and height are determined from the x and y errors in the same way as they are for the xyerrorbars style—either from xlow to xhigh and from ylow to yhigh, or from x-xdelta to x+xdelta and from y-ydelta to y+ydelta, depending on how many data columns are provided.
An additional (5th or 7th) input column may be used to provide variable (per-datapoint) color information (see ‘linecolor‘ and ‘rgbcolor variable‘).
The interior of the boxes is drawn according to the current fillstyle. See ‘set style fill‘ and boxes for details. Alternatively a new fillstyle may be specified in the plot command.