Plots of atomic line-doublet intensities against the sum of the CO 2–0 and 3–1 bandhead intensities (in units of 10-17 W m-2); top – Na i 2.207 μm + 2.209 μm, middle – Ca i 1.978 μm + 1.987 μm, bottom – Mg i 1.503 μm + 1.505 μm.
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