Extended Data Table 1 Number of levels and line transitions used in the PoWRHD models

From: Discovery of a transitional type of evolved massive star with a hard ionizing flux

  1. The levels and lines listed for Fe – a generic element that also includes Sc, Ti, V, Cr, Mn, Co, and Ni – correspond to superlevels and superlines (see Gräfener et al. 200216).
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