Fig. 1
Mg i 4571 Å (left panel) and 5173 Å (b2, middle and right panel) observed and synthetic line profiles for the Sun. The third panel magnifies the b2 core. The black solid lines are the observed profiles (Kitt Peak solar flux atlas, Kurucz et al. 1984) while the red dotted, green dashed, and blue dash-dotted lines are the synthetic profiles obtained by using three different atmospheric models, VALC, FALC, and ALC, respectively.
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