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           List of detectors to be read from the disk. If you only need a few detectors for analysis, list their name names here. The reading process will be faster since we don't need to read other detectorsunused detector data is not ready.

• filter= filter_fn

           You can write a filter_fn(evt) callback which returns True or False to include or exclude the event from getting read from the diskdisk.  Note that this can be used to select specific events by filtering on evt.timestamp.

• small_xtc=['detname1', 'detname2']

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