How can I export the data of a graphline?

[incognito]

I have performed a test, and the results are available in the graph with the frequency verses dBuV in graphical format.

I now need the output in data format rather than graphical.
This data is to be imported into proprietary software to perform some additional calculations.
How can I export the real data values from the graphline?

[joro]

A detailed explanation of how the data of a graphline can be exported, can be found here: viewtopic.php?f=12&t=145&start=0