These are measurements of the loop gain transfer function of the IMC cavity loops running on MC2. The first pdf shows the loop gain transfer function on M2, the second is the loop gain transfer function on M3. Note the good agreement with the model.

The UGF of M2 is about 3.2 Hz
The UGF of M3 is about 6.5 Hz

The data for the M2 plot live in
/sus/trunk/HSTS/H1/MC2/Common/Data/2013-07-26_H1IMC_M2-M3_Crossover_OLGTF_TF_Export
The data for the M3 plot live in
/sus/trunk/HSTS/H1/MC2/Common/Data/2013-07-26_H1IMC_MCL-MCF_Crossover_OLGTF_TF_Export

The matlab function that makes these plots is
/ligo/svncommon/SusSVN/sus/trunk/HSTS/Common/FilterDesign/IMCmodel_H1_MC2_M2M3hierarchicalfeedback_26July2013.m