The first attachment shows the distribution of data during O3, ordered by how long into a high-power lock stretch the data were taken. High-power lock segments were identified by either H1:GRD-LASER_PWR_OK:1 or L1:GRD-PSL_OK:1. Solid lines show the data during observing mode only ([HL]1:DMT-ANALYSIS_READY:1); dashed lines show all data accumulated during high-power operation.

Half of observing-mode data were accumulated within the first 9 hours of lock, a third of data were accumulated within the first 6 hours of lock, and a fifth of data were accumulated within the first 3 hours of lock. The distributions are remarkably similar between H1 and L1, and so far, L1's distribution for the first few weeks of O4 seems similar to the distributions for O3.

The second attachment shows the distribution of data during O3, ordered just by total lock length (i.e., without regard to how far into a particular lock stretch the data were taken). Half of observing-mode data were accumulated during locks of more than 20 hours.