Lack of emission lines in the optical spectra of SAX J1808.4–3658 during reflaring of the 2019 outburst

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Fig. 4.

Average X-shooter UVB spectrum of SAX J1808, acquired on MJD 58726.0093 and corrected for Galactic absorption. The UVB arm is scaled to match the VIS flux. There are obvious absorption lines from the Balmer series, but no characteristic HeII emission line or Bowen complex (λ4630−4660 Å).

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