Fig. C.2

HST/GHRS spectra of the [Si iv] 1393.76 and 1402.77 Å lines of W Ser at two distinct phases (black: z0lu5108t observation made on 1991-07-12 (05:32:25) at phase Φ = 0.00, primary eclipse; red: z0lu0308t observation made on 1991-07-19 (03:29:13) at phase Φ = 0.5, secondary eclipse).
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