Fig. 1
Examples of SEI line synthesis fits (dots) to Siiv λ1393.76 (upper panels) and Siivλ1402.77 (middle panels) for our sample of B supergiants (Table 1). The lower-most panels show the corresponding radial optical depths for the blue (blue filled circles) and red (red open circles) doublet components. (Normalised velocity, w, = v/v∞.)
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