Open Access

Table 5

Repeatability of the interim values before the combination of XRF and XPS data.

  Mean Standard deviation Relative standard deviation (%)
dO 139.5 ng/cm2 2.3 ng/cm2 1.7
cSiO2 19.9 at% 0.3 at% 1.3
cSiOx 20.9 at% 0.8 at% 4.0
cC 19.6 at% 1.1 at% 5.6
cO 59.5 at% 0.6 at% 0.9

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