Plotting U,Z variables from X,U and X,Z experimental data tables

[weierstrass]

Hi guys!

I've been struggling from some time with this problem...

Well, I'm going to try to be clear with my explanation:

I have two data tables from laboratory tests, using two different equipment. The first table is time (X) versus Stress (U). The second table is time (X) and Hit counts (Z). Despite that initial zero time is the same in both tables, the time values (instants) are different.

I can plot a chart with double Y-axis (U and Z), having two series but I would like to draw a U vs Z scatter chart.

In the attachment I send na example for my type of data.

Anyone can please help me to solve my problem?

Thanks a lot!