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This page describes techniques for generating a bar chart in a Wikipedia page, by coding a set of numbers in a <timeline>...</timeline>
tag format. It can display charts in various formats. The whole image is scaled by a command, e.g. "ImageSize=width:180 height:90", and using the keyword "bar" triggers the bar chart features. However, the {{Bar chart}} can easily format a horizontal bar chart (scrolling down a page), with one or two or four columns of bars in a chart.
Here, with the <timeline>...</timeline>
, the a vertical bars is formatted by the command "TimeAxis=orientation:vertical" (before specifying the data for the bars). The width of bars is set by "PlotData=width:20". The color of any bar can be set by appending the keyword "color:" (such as "color:lightgrey") at the end of each bar's numeric data.
For other optional parameters see § Bar chart commands and attributes, or full list at Help:Timeline.
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