Syntax:
set bars {small | large | fullwidth | <size>} unset bars show bars
small is a synonym for 0.0, and large for 1.0. The default is 1.0 if no size is given.
The keyword fullwidth is relevant only to histograms with errorbars.
It sets the width of the errorbar ends to be the same as the width of the
associated box in the histogram. It does not change the width of the box
itself.