What you really want is the second level. This color is also used for the labels, titles and axis in the graphs. Only about 30 colors are recognized in the graphs. If the color you choose is not known, it will revert to black for the graph titles, labels and axis. This is the name of the desired typeface for the report titles.
Data sets can use two colors that alternate with rows for better legibility.
These rows provide additional summary information, but are not graphed. The graphs section of your setting files contains settings to control the formatting of the graphs. This allows you to specify a color to be used for the graphing area of the graph. If none is given this will use the report page background color. This is separate from the background color for the graph image which will always match the report page backgroun color.