Fig. 1
Differing CNO morphologies in early B-type supergiants illustrated by VFTS 431 (“Nstr”) and VFTS 578 (“Nwk”). In addition to the Balmer lines, the absorption features identified are: C II λ4267; He I λλ4009, 4026, 4121, 4144, 4388, 4471, 4713; Mg II λ4481; N II λλ3995, 4601-07-14-21-31, 4640-43 (blended with O II); O II λλ4070, 4254, 4317-19, 4350, 4367, 4414-17, 4591-96, 4650, 4661, 4674-76; Si III λλ4553-68-74.
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