Parameter from bearing ratio curve and profile height amplitude curve Rku Pku Kurtosis of profile Material ratio curve of the profile Profile height amplitude curve Wku (Abbott Firestone curve) Quotient of mean quartic of the ordinate values Curve representing the material ratio of the Sample probability density function of ordinate Z(x) and 4th power of Pq, Rq, Wq respectively, profile as a functional of level c. Z(x) within an evaluation length
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