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. 2015 Sep 24;5:14387. doi: 10.1038/srep14387

Table 2. Micro Hardness.

Indentation Test 100 g (MPa) 200 g (MPa)
Vegetable Ivory (Jarina)
 —Transverse Plane 124 ± 25 129 ± 17
 —Radial Plane 100 ± 35 103 ± 33
Elephant Ivory11
 —Circumferential Plane 390 350
 —Radial Plane 310 270

The errors provided for vegetable ivory represent the 1.96 times the standard deviation. The elephant ivory data11 mention that their maximum standard error is less than 12%.