This article has an erratum: [https://doi.org/10.1051/0004-6361/201526027e]
Direct comparison between the HET spectrum of the 2012 eruption of M31N 2008-12a (t − tmax = 0.62 ± 0.1 days; black line; DWB14) and the second epoch spectrum of the 2014 eruption (LT; t − tmax = 0.26 days; grey line). Bottom panel: residuals following subtraction of the 2012 spectrum from the 2014 spectrum.
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