Creating a histogram Styles can alter the way data is presented in arbitrary ways. Here the histogram style is used to generate a histogram. ... By default the histogram draws a box for each histogram value, but you can set the `step` parameter of the histogram style to use steps instead. ! In this basic use-case the histogram is calculated out of equal-spaced x-values automatically. You can also use errorbar like data in one graph dimension to generate histograms with different widths of the histogram boxes. ! Note that a histogram is very different from a bar graph in that it uses regular axes (like the default linear axes in this example) in both graph dimensions. Instead, bar graphs use a discrete axis.