Fig. 6
Upper limit determination for iron, comparing stacked spectra centered on the six strongest unblended lines, Fe i 3440.6, 3581.2, 3719.9, 3737.1, 3820.4 and 3859.9 Å. The 3D NLTE line profiles are shown for the 1σ, 2σ and 3σ upper limits, corresponding to line strengths of 0.7, 1.5 and 2.2 mÅ. The small bump at + 0.4 Å in the synthetic spectrum is due to the nearby line Fe i 3441.0 Å.
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