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An example of using the MeanVsScan Box to plot an average parameter (in this case the width of a distribution) vs. the fly-scanned PV.  "fly scan" means the scan value is changed independently while the DAQ free-runs.  Compared to a "step scan" (see below) it has the disadvantage that there is no precise knowledge of the scan variable value at each event, since the scan variable is moving during data taking and is only recorded by the DAQ at 1Hz~1Hz.  Note that this example uses a "MeanVsScan" box which can be used for both fly-scans and step-scans: for fly scans the "binned" option (and histogram limits) of the MeanVsScan box should be selected in advance.

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