Fig. 2

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Synthetic spectra for Eu II 4129 Å (left) and Eu II 6645 Å (right) generated from TSFitPy base on solar parameter with A(Eu)=0.57 dex. The red solid lines represent the line profile generated from 1D LTE and the blue solid lines are from 1D NLTE, while the red dash lines represent the line profile generated from <3D> LTE and the blue dash lines are from <3D> NLTE.
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