Series X Y
Vec A 0 0
2.3 10.8

Vec B 0 0
-26.3 -10.8

Vec C 0 0
-2.3 -10.8

Vec D 0 0
26.3 10.8

Four series x y scatter chart, the data source for each series continually
resets to x(range)=y(range) making for in inaccurate chart result

This same setup works properly with Office 2003 SP2.