A negative trend in iron abundance with EP suggests that the temperature in the model atmosphere is too high; this is because the higher temperature model predicts that there will be more electrons in the higher excitation states than there are in reality.
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Abundances of Neutron-capture Elements in 62 Stars in the Globular Cluster Messier 15.
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The [Ba/H] abundances vary more significantly, with an average offset of Δ[Ba/H] = −0.22 ± 0.16 and a hint of a possible trend.