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Fig. 3


LT i-band image of the 2013 eruption of M 31N 2008-12a taken on 28.94 Nov. 2013 UT. The RN position is shown by the white circle; the white boxes indicate the coincident HST ACS/WFC fields. Inset: HST ACS/WFC F814W image of the ~2′′ × 2′′ region surrounding M 31N 2008-12a. The inner and outer green ellipses indicate the 1σ (31 mas) and 3σ radius progenitor search regions, respectively, and the red cross indicates the position of the progenitor candidate. See text for discussion regarding stars 1 and 2.

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