Dear Peter,
Thank you again for your answers. It is now clear to me:
Yes we did orthogonalize the parametric modulator and of course the height/density(Hz) of the input is due to mean-cenetring. By mean-centering the parametric values 1, 4, 9, 16, 25 I get -10, -7, -2, 5 and 14 and those are exactly the values I see in the input plot.
Though it was just a small question your hints helped me a lot.
Best,
Isabel
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