Fig. 2
Multiepoch optical spectra of selected LBVs. Top panel – the P Cygni star J013339.52+304540.5; note that the 2010 spectrum is reproduced in Fig. A.3, where weak Si iii, O ii and C iii absorption features are visible. Bottom panel – the bona fide LBV M 33 Var C, with the spectrum of the cool F0-5Ia+ hypergiant B324 overlayed (Monteverde et al. 1996, and Sect. 5.3.2).
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