Agilent Technologies 86038A User Manual page 119

Display Menu Function Reference
Window
Use the slide bar to select the number of consecutive trace points that are
processed to yield one smoothed point (at the center of the Window). The
smoothing process is repeated centered on each trace point.
Hide Original Trace
Removes the original trace from the graph so that only the smoothed trace
is visible.
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Agilent 86038A Optical Dispersion Analyzer, Third Edition