Multiple color column charts show data from a single series with a different color for each vertical column. They look like grouped column 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 horizontal X axis is a category axis: year values are distributed at equal intervals on the axis. Each year column has a different value.