Use this option to modify the labels that are displayed for the horizontal (category) axis.
Axis label range Displays the range of the labels that correspond to the selected series. In this box, select the existing range, and then type the range that you want to use for the axis label. You can also click in the Axis label range box, and then select the range on the worksheet. The Collapse Dialog button at the right end of this box temporarily minimizes and moves the dialog box so that you can select cells on the worksheet. To return to the entire dialog box, click this button again after you select the range.