SN 2011dh (dereddened and redshift corrected) in the NIR at 200 days (red). The observed spectrum is composed of 1−1.5 μm observations at 198 days scaled with exp(−2 × 2 / 111.4) and 1.5−2.5μm observations at 206 days, scaled with exp( + 2 × 6 / 111.4). Also plotted is model 12C without (blue dashed) and with (black solid) a dust component (τ = 0.25, xdust = 0.05). Line identifications from the model are labelled. A dust component clearly improves the fit above 1.5 μm.
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