Conclusion: ALS beams and IFO alignment changes contaminate both ETM HWS but they should still be trusted after we are at a stable alignment: ring heater tests visible on both but self heating seen only on ETMX, image too noisy on ETMY. See attached HWS images and spherical power data.

Both ETM HWS are able to see ring heater tests alog#65075 (when ALS shutters and IFO not changing alignment). ETMX can see the self-heating from IFO beam but the optical power doesn't seem calibrated. Point absorbers hard to distinguish on ETMX but maybe is a few small ones and and one upper left of IFO beam - shown by pink arrow on attached pdf.

See alog 66011 for explanation of alignment change contamination for ITM reflections.