Multiple color bar charts show data from a single series with a different color for each horizontal bar. They look like grouped bar charts, but they are still single-series.
Our US Sales demo charts show totals of product quantities sold in US in three different years. The single series is the US country, and the values for each year are 2007, 2008 and 2009. Remark the vertical X axis is a category axis: year values are distributed at equal intervals on the axis. Each year bar has a different value.