Hi,
You can make a dummy legend and format it to superscript as needed.
1. Remove the border from the current legend
2. In the Series name box enter spacebar in 2003 or ="" in 2007 this remove
the default text.
3. Create a text box with the necessary series names for your legends.
4. Select the portion of the text that you want superscripted and use the
Format command and apply super script to the selected portion of the text.
5. Position the textbox relative to the legend keys.
6. Insert a rectangle and set the interior color to none.
7. Place this around the legend as needed.