To format the colors of the levels in a surface chart, you must format the legend key.
If the chart doesn't have a legend, add one.
Click the legend once to select it, and then click the legend key that represents the surface level you want to change.
On the Format menu, click Selected Legend Key, and then click the Patterns tab.
Click the color you want, and then repeat steps 2 and 3 for each level you want to format.
Note: If you want to delete the legend, click the legend, and then press DELETE. The colors you specified remain in the surface chart after you delete the legend.