These pages outline the chart configuration options, and the methods and properties of Highcharts objects.
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The minimal height for a column or width for a bar. By default, 0 values are not shown. To visualize a 0 (or close to zero) point, set the minimal point length to a pixel value like 3. In stacked column charts, the length is applied to each point in isolation, so tightly packed values may overlap. See the stacked sample below for a plugin that lays out the stack as a whole instead.