I analyzed the PEM injection data:

1. Acoustic injection to PSL room
11/25 12:31:00 - 13:05:00 (JST)
EXC : K1:PEM-EXCITATION_MCF0_RACK_13_EXC
REF : K1:PEM-MIC_PSL_TABLE_PSL1_Z_OUT_DQ
Info : PSL 50 - 900 Hz 171 point 5 Hz resolution 100 cnt excitation

The projected noise was dominant around 400Hz widely.