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Useful for either step-scans or fly-scans.  Compute the mean of a value or waveform as a function of step number (for a step-scan) or the fly-scanned value (for a fly-scan).  Internally uses the ReduceByKey pattern.

SumN

Sum N events with a pattern very similar to PickN.  See the PickN section below for some integer-arithmetic related subtleties.

Global Operations Typically Used Internally By AMI

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