Thanks to the matlab script Stuart A. wrote, I processed the DTT transfer functions of PR3 M2-M2 undamped TF and compared them with the ones from Livingston.

The TF were taken with a white noise excitation, while PR3 was under vacuum in July 2013, with the ISI damped.

The results of the three degrees of freedom are presented in the attached pdf

(1) First attachement compares the measured LHO PR3 M2-M2 transfer function against the model.

(2) Second attachement compares LHO PR3 M2-M2 against last measured PR3 M2-M2 TF from LLO (today) which was under vacuum.

Data are noisy at DC and above 5Hz but the measurements are matching very well the model and LLO's transfer functions.