Fig. 9
Comparison of 2010 (“cool” state) and 2012 (“hot” state) spectra versus the B1 Ia+ hypergiant ζ1 Sco, P Cygni and the M33 WN9h star J013327.26+303909.1 with major transitions indicated. Note that in the absence of a cool toroid circumstellar envelope, we would not expect the three comparison spectra to demonstrate the rich low-excitation metallic emission spectrum of S18.
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