Fig. 9.

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Zoom-in onto the Fe II absorption lines from the SN ejecta at selected epochs of the photospheric phase. The SN photosphere expands with a velocity of merely ≈8500 km s−1. There are no signs of deceleration between tmax and tmax+100 days. Starting at about tmax+30 days, emission from [O III] λλ 4959,5007 (grey shaded region), produced by the interaction of the SN ejecta with circumstellar material, contaminates the blue wing of Fe IIλ 5169.
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