Miinimumtsooni kesktugisirge on määratletud rööpsete joonte paariga, mis ümbritsevad kogu sirgsusprofiili nii, et joonte vaheline kaugus (tsoon) on minimaalne ja kuvatud miimimutsooni keskjoon/kesksirge on nende kahe rööpse joone/sirge vaheline keskmine asukoht ja sellele viidatakse kõigi sirgsusparameetrite arvutustes.
The mean minimum zone reference line is defined by a pair of straight, parallel lines which just enclose the entire profile such that the distance between the lines (the zone) is a minimum. The displayed mean minimum zone reference line is the mean position between these two lines and to which all parameter calculations are referenced.
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