Fig. 18.
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Late-time evolution of the [O I] λλ 6300,6364 doublet. Note the strong evolution on the blue side, while the red side of the lines is evolving slower. This indicates a transition from optically thick to optically thin [O I] lines, implying that the scattering in the absorption part of the P Cygni profile is decreasing. Regions of strong atmospheric absorption are grey-shaded.
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