Looking for measurments NOT MADE BY DEKONI - Dekoni pads vs standard velour pads for Sennheiser HD 6** series

I am looking for measurments that would let me compare FR of Sennheiser HD 600/650/6XX/660S with standard velous pads vs with various types made by Dekoni.

Graphs made by Dekoni themselves are a bit weird i.e. downsloping and IMO hard to read. That is why I am looking for another party’s measurments.

Thanks in advance for help.