Distance and extinction-corrected SEDs for the progenitor of M 31N 2008-12a compared to those of the quiescent RNe RS Oph, T CrB, and U Sco (see Key for line identifications). Units chosen to allow comparison with a similar plot in Schaefer (2010, see their Fig. 71). The black dotted line indicates the maximum effect of any internal M 31 extinction (). For each system, point-to-point uncertainties are small, indicated error bars are dominated by distance and extinction uncertainties.
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