EXCEL: Data Label in “XY Scatter Chart”

I have the following data

A1 A2 A3 A4 A5 A6
50 250 10 240 450 490
20 90 40 35 50 70

When I build an XY scatter chart using second and third line i get a perfect chart. If i request a Data Label (Show label) i get numbers from the second linedisplayed as labels next to points on my chart.
I want the info from the First line to appear as a datalabel next to the point. I can do it mannually, but i have a long series of data.

How can do it?????????