set boxwidth <width>
The setting boxwidth alters Pyxplot’s behaviour when plotting bar charts. It sets the default width of the boxes used, in ordinate axis units. If the specified width is negative then, as happens by default, the boxes have automatically selected widths, such that the interfaces between them occur at the horizontal midpoints between their specified positions. For example:
set boxwidth 2
would set all boxes to be two units wide, and
set boxwidth -2
would set all of the bars to have differing widths, centered upon their specified horizontal positions, such that their interfaces occur at the horizontal midpoints between them. The specified width may have any physical units, but must be real and finite.