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| sq | root mean square height of the surface |
| ssk | skewness of height distribution |
| sku | kurtosis of height distribution |
| sp | maximum height of peaks |
| sv | maximum height of valleys |
| sz | maximum height of the surface |
| sa | arithmetical mean height of the surface |
| sk | core roughness depth |
| spk | reduced peak height |
| svk | reduced valley depth |
| smr1 | peak material portion |
| smr2 | peak valley portion |
| sxp | peak extreme height |
| vvv | void volume of the valleys |
| vvc | void volume of the core |
| vmp | material volume of peaks |
| vmc | material volume of the core |
| sal | fastest decay auto-correlation rate |
| str | texture aspect ratio of the surface |
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