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. 2019 Nov 28;19(23):5244. doi: 10.3390/s19235244

Figure 2.

Figure 2

Calibration curves of different Ca lines in soil, integrated line intensity over calculated Ca mass fraction: R2 (443.496 nm) = 0.994, R2 (445.478 nm) = 0.996, R2 (616.217 nm) = 0.993 (individual wavelengths are offset for visibility).