Considering the CCFC+green OLTF shown in elog2758 and the IR locking accuracy (CCFC error signal) without CCFC, we can estimate the expected IR locking accuracy with CCFC. I compared the estimated IR locking accuracy with CCFC and the measured one as shown in the attached figure. As you can see, the two spectra agree well. The discrepancy between 10-100 Hz could be because the measured spectrum would be limited by the spectrum analyzer noise between 10-100 Hz.