Fig. 4
Comparison between our iron abundances and the results derived from M11 under LTE (left panel) and NLTE (right panel) cases. The abundances obtained from Fe I lines are plotted with open circles and Fe II are plotted with filled circles. The dash line shows the Fe I offset from the metallicity 1:1 solid line, which is 0.031 dex under LTE and 0.029 dex under NLTE.
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