An investigation about the peak at 48.05 Hz was performed some months ago, injecting vertical noise on the payloads, because the vertical resonance of F7crossbar/Marionette was expected around that frequency. No vertical resonance was found exactly at 48.05 Hz, but the injection on WE payload had the effect to excite the 48.05 (beside the known vertical resonance, at 48.38 Hz).

The acoustic injection reported here has increased a lot the correction on the payload and F7, due to the local sensor which got noisier.

A more accurate shaking of WE payload can be performed, in order to see if something more clear come out.