Select the Multiple areas check box and click the Multiple areas button in the Plot: General options pane of the Graph Options dialog (accessible via the Format menu) or in the General dialog (accessible by right-clicking on any line or marker in a graph and selecting General Plot Options from the shortcut menu) to display the Category Overlay Areas dialog.
Pattern. Click any of the Pattern buttons to display the Area Properties dialog, in which you can change the color, pattern, and style of the different areas of the graph.
Close. Click Close to accept your changes and return to the previous dialog.