OptionalscanWhere the scan the analysis was made from can be seen. Stanford's files name their scan by DRUID, so this is only needed for an analysis of a scan hosted elsewhere.
OptionalsystemThe bar the scanned roll was cut for. The scan is calibrated on it and the holes keep its numbering, since a copy is read by the bar it was cut for and by no other.
OptionaltrackAdded to the scanning software's hole numbering to reach the tracker bar. Left out, it is inferred by putting the rewind perforation on the bar's rewind track.
How
readFromStanfordAtonreads an analysis file: how its hole numbering is shifted onto the tracker bar, which bar the roll was cut for, and where its scan can be seen.