Comparisons of the Sr abundances calculated by our work ([Sr/Fe]_LGBM) and values determined from N19 ([Sr/Fe]_N19). The yellow line represents that the predicted value is equal to the target value. The yellow dot represents the point at which ∣[Sr/Fe]_{4077 Å} − [Sr/Fe]_{4215 Å}∣ ≥ 0.5 in N19. The left shows the differences between [Sr/Fe]_LGBM and [Sr/Fe]_N19 in the prediction of 4077 Å (Sr II), and the right shows these differences in the prediction of 4215 Å (Sr II).