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Mean peak height Rp is the arith­met­ical mean of the heights of the highest profile peaks Zphi ("peak heights") of each profile section of the roughness profile.

Mean pit depth Rv is the arithmetical mean of the depths of the deepest profile pits Zvdi ("pit depths") of each profile section of the roughness profile.


Maximum peak height Rpt is the height of the highest profile peak Zphi of the roughness profile within the evaluation length le.

Maximum pit depth Rvt is the depth of the deepest profile pit Zvdi of the roughness profile within the evaluation length le.