Superimposing and normalizing TGraphs with different scales


I have a little problem: I would like to have 4 different graphs in the same plot (2 measurements, 2 reference values) to be able to compare them. Unfortunately the scales are different by several orders of magnitude. At the moment I have them superimposed in the same plot using 4 TGraphs with 3 pads, but it would be great to have all of the plots normalized to a mean value of zero on the y-axis and the sigma normalized to 1 to really compare them. So in other words, i need to see the correlation between the data and the reference value, but the absolute numbers are very different. I attach a picture of the plot to make it more clear.

I hope that somebody can help me with doing this in an elegant way. Thanks very much in advance!

see example in tutorial transpad.C