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The original ticket stated that there should be 1 pulsar file per observation. The matching should occur by a substring of the file name. Looking in /lustre/aoc/sciops/pdemorest/18A-210 at eb 18A-210_sb35401562_1_1.58271.256401238425, I see 84 matching (.ar) files.
So the issue of mapping observation to pulsar file is still not decided. If I have a specific example I can use that.