This article has an erratum: [https://doi.org/10.1051/0004-6361/201526027e]
Liverpool Telescope SPRAT spectrum of the apparent south-western “knot” in the extended emission around the position of M31N 2008-12a (solid black line; see also Fig. 8). The spectral range has been truncated to show only the region with significant emission; likely Hα, [N ii] (6584 Å), and [S ii] (6716 and 6731 Å) emission is labelled. The solid grey line indicates a simultaneous fit to the Hα and [N ii] (6584 Å) emission lines.
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