This post summarizes some features of the 106.06736 comb’s history over O4 so far. This comb was found in the run-averaged spectrum (Fig.1) while updating the lines lists. Its cause is unknown. 

• There are several peaks over the course of the run in the 106 Hz region. Not all of these peaks occur at the same time.
• For some of these peaks, it appears that the peaks entirely disappear during breaks occurring at least one month later. For others, the peaks continue after the breaks, as evidenced by the attached weekly spectrogram (Fig.2).

Attached are static images of plots displaying the comb’s structure and behavior. Fig.1 is the run-averaged spectrum of the comb and the other two (Figs.2 and 3) are spectrograms of it. The blue spectrogram in Fig.2 is weekly over the ongoing O4 run and the green spectrogram in Fig.3 is daily.