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(gnuplot.info)boxwidth

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Enter node , (file) or (file)node

 The `set boxwidth` command is used to set the default width of boxes in the
 `boxes` (Note: boxes ) and  `boxerrorbars` (Note: boxerrorbars ) styles.

 Syntax:
       set boxwidth {<width>}
       show boxwidth

 If a data file is plotted without the width being specified in the third,
 fourth, or fifth column (or `using` (Note: using ) entry), or if a function
 is plotted, the width of each box is set by the `set boxwidth` command.  (If a
 width is given both in the file and by the `set boxwidth` command, the one in
 the file is used.)  If the width is not specified in one of these ways, the
 width of each box will be calculated automatically so that it touches the
 adjacent boxes. In a four-column data set, the fourth column will be
 interpreted as the box width unless the width is set to -2.0, in which case
 the width will be calculated automatically.  See `set style boxerrorbars` for
 more details.

 To set the box width to automatic use the command
       set boxwidth
 or, for four-column data,
       set boxwidth -2

 The same effect can be achieved with the `using` keyword in `plot`
 (Note: plot ):       plot 'file' using 1:2:3:4:(-2)