Fig. A.1
Example B-type supergiants (Class Ia). The primary diagnostic lines for spectral classification are identified. In the spectrum of VFTS 525 these are: He II λλ4542, 4686; Si III λλ4553-68-74; Si IV λλ4089, 4116; those identified in VFTS 269 are: He I λλ4009, 4026, 4121, 4144, 4388, 4471, 4713; Mg II λ4481; Si II λλ4128-32. The broad λ4428 diffuse interstellar band is also evident in some sightlines.
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