In Excel x,y type charts, the x range must be re-entered for each series if
the data range is beyond the complexity supported. Please consider a
sub-type for graphs where all of the x ranges are the same. Also, consider
making the data range feature have options for using the top or left row for
series names, and the left or top row for the x range. Even better, allow
multiple rows or columns at top or left for series names.

----------------
This post is a suggestion for Microsoft, and Microsoft responds to the
suggestions with the most votes. To vote for this suggestion, click the "I
Agree" button in the message pane. If you do not see the button, follow this
link to open the suggestion in the Microsoft Web-based Newsreader and then
click "I Agree" in the message pane.

http://www.microsoft.com/office/comm...excel.charting