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(A) Active segment detection (yellow intervals) of a stimulation block segment of a synthetic 80-s-long S1S2 protocol with 20 randomly distributed extra beats – A shows 5 extra beats. S1 peaks have a cycle length of 600 ms. (B) Histogram of all time intervals between active segments. x-axis cut at 5000 ms. Time interval corresponding to S1 cycle length and the harmonics present the highest contribution. (C) Fourfold increase of extra beats does not change the three main contributors.
