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

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Fig. 5.

Average X-shooter optical spectrum of SAX J1808, from observations on MJD 58726.0093. The spectrum is substantially featureless, except for telluric absorptions throughout. The top right inset shows a zoomed-in view of wavelengths around the missing Hα. Only a very thin dip is present at λ6563 Å.

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