Search from the parameters list Height Sa (arithmetical mean height) Sz (Maximum height) Sq (Root mean square height) Ssk (Skewness) Sku (Kurtosis) Sp (Maximum peak height) Sv (Maximum pit height) Spatial Sal (Auto-correlation length) / Str (Texture aspect ratio) Std* (Texture direction) Hybrid Sdq (Root mean square gradient) Sdr (Developed interfacial area ratio) Functional Smr(c) Areal material (bearing area) ratio Smc(mr) Inverse areal material ratio Sk(Core height) Spk (Reduced peak height) Svk (reduced dale height (reduced valley depth)) Smr (Peak material portion) Smr2 (Valley material portion) Sxp (Peak extreme height) Functional volume Vvv (Dale void volume) Vvc (Core void volume) Vmp (Peak material volume) Vmc (Core material volume) Feature Spd (Density of peaks) Spc (Arithmetic mean peak curvature) S10z / S5p / S5v / Sda(c) / Sha(c) / Sdv(c) / Shv(c)