Currently (2025/10/17) there is missing data causing "gaps" in some of the KAGRA low-latency gwf files. These gaps will cause I/O error when reading strain data in the science mode from these files. I used lalfr-dump to find all the gaps in KAGRA O4a low-latency strain channel and masked the gaps from the current science segments. By reading strain channel in the masked science segments, we can avoid I/O error.

The gaps will be filled after the regeneration of KAGRA O4a data is done.

The gaps, masked science segments and the details of the generation of the masked science segments can be found here: JGW-G2516947. The scripts used and the segment file can be found on Main Data Server (kmst2-01), please refer to the slides.