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. 2015 Aug 3;112(34):10669–10672. doi: 10.1073/pnas.1509491112

Table 1.

Means and standard deviations of nanoindentation hardness values obtained for soft particles and the enamel surface

Property Enamel (n = 25) Al (n = 17) Brass (n = 20)
Hardness, GPa 4.62 (0.14) 1.29 (0.078) 2.60 (0.15)
Data range 4.33–4.99 1.20–1.40 2.26–2.91

Here, n denotes number of measurements.