Normalized distribution of natural log Bayes factors of 112 off-source segments (blue) and 42 three-detector events in GWTC-3 (orange). All GWTC-3 events have a small Bayes factor with the highest of ﹩\mathrm{ln}{ \mathcal B }=1.5﹩, indicating no signal. The background study shows multiple off-source data segments exhibit larger Bayes factors than the GWTC-3 events due to nonstationary noise.