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Comparison of the D14 models with observations. pEWs of the Fe ii 5018 Å absorption line measured at 50 d plotted against the host H ii-region oxygen abundance using the O3N2 M13 diagnostic, with the positions of the six distinct models over plotted. The red circles indicate the same progenitors changing metallicity, while the triangle (m15mlt1, larger radius) and square (m15mlt3, smaller radius) present the same metallicity but changing pre-SN radii.
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