| http://www.w3.org/ns/prov#value | - It is preferable that the difference in height between irregularities (difference between a concave portion and a convex portion) should be 0.5 ??m or 5 ??m or between 0.5 and 5 ??m, particularly preferably 1 ??m or 3 ??m or between 1 ??m and 3 ??m.
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