Click the series button to change what series to display in the chart. This drop-down stays on screen while selecting one or more series (the changes are directly propagated in the chart). To close the list either press the ESC button or click outside the list. If only one series is selected then its name is listed in the button label. If additional series are selected then the number of selected series are listed in parentheses. Only columns that are of number data types can be selected as series.
Tip: Press the ALT key while selecting a series and all currently selected series will be de-selected.