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Actuation events of point-operating machine POM-4 in the RN direction. The events are recorded on two separate days—2018-03-13 (A) and 2018-05-17 (B)—with their FFT log10 transformation and linear curve from each event directly below (C,D). The red ellipse (A,B) highlights the area of the two actuation events that show variability in the signal, which is reflected in the observed RSE values.
