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Introduction: The evaluation method identifies periodically domi­nant char­ac­teristics; param­eters are derived from this special waviness profile (WD-profile).

WDSm: The mean horizontal size of the profile elements calculated from the amplitude spectrum (mean period length of dominant waviness).

WDc: Mean height of the profile elements within the evaluation length.

WDt: Vertical difference between the highest and the lowest point of the WD-profile within the eval­u­ation length.