During the TCS shift of May 23, the beam splitter control was set from drift control to full bandwidth (refer to V1:SAT_BS_AATX_FLAG; see 45945). In this period the 150 Hz side-bands were more clearly visible (see 45953, fig. 4). We run the side-band tool developed by B. Patricelli to investigate this, and we found high coherence values when using the angular controls channels (e.g., V1:ASC_BS_TX) as modulator signals. In attachment the plots of the noise projections with the above mentioned channel, for three gps time: May 23, 6:00 UTC (with the beam splitter in drift control) and May 23, 10:00 UTC and May 25, 20:00 UTC (with the beam splitter in full bandwidth control). From all the plots it is clear that the 150 Hz line/side-bands/bump are strongly influenced by the beam splitter alignment controls.