How do I format a picture fill in my pie chart?
 

I've put a picture into a 3-D pie chart in Excel by clicking on the wedge I
want, going to fill effects, and inserting a picture. However, I don't want
the picture to show on the vertical sides of the chart - I want that just to
be white. There's a menu in the picture fill effects tab that has an Apply
to: menu and check boxes next to Sides, Front and End, but I'm not allowed to
use them.

Is there any way to take the picture off the sides of a 3-D pie chart while
leaving it visible on top? Thanks.