Is numeric "Series Axis" possible?

When I make a simple 3-D surface chart in Excel, the "series axis" is automatically displayed as S1, S2, etc. Is there a convenient way to have that axis display numbers instead?

For example: the following 2x2 surface is generated by multiplying the x-value to the y-value:


y
5 10 15
4 8 12
* 2 3 x-axis

However,the Y (series) axis (4 and 5) automatically defaults to S1 and S2; I know I can change the names of the series to match, but I wish they would change automatically if I were to change the Y-axis values (e.g. from 4 and 5 to: 1 and 2)


y
2 4 6
1 2 3
* 2 3 x-axis


Any ideas?