The B4 phase camera has been misleading, indicating lower powers on B4 for both the 6MHz and 56MHz than in March.

Figure 1 shows the power in the last two days, with 0.05 on PC B4 56MHz, 0.075 on PC B4 6MHz, up to 0.024 on B4 112MHz mag and between 0.03 and 0.04 for B4 12MHz mag.

Figure 2 back in March the power on B4 112MHz mag was 0.026 and on B4 12MHz mag was 0.036, so similar to the last two days, but the PC powers were 50% higher, with 0.08 on PC B4 56MHz and 0.11 on PC B4 6MHz .

Figure 3. looking at the long term trend of the phase camera, all of the powers including carrier power decreased, the ratio is about a factor 1.4. So that would explain why the sidebands as measured by the phase camera decrease. For example the phase camera alignment changed, on the reference beam power changed, and it shows value that are 40% lower now compared to two months ago.