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Fig. 25


Zoom-in on the [O I] λ5577, Na I λλ5890, 5896 and [O I] λλ6300, 6364 lines in SN2011dh at 99, 152, and 202 days. Both oxygen lines show blueshifted line profiles at 99 days, but the peaks then gradually move towards zero velocity. The Na I D lines show no blueshift as they mainly arise from envelope scattering (giving a P-Cygni like profile) rather than from the self-absorbing core.

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