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Fig. B.2.


One-dimensional spectrum (black) of the faint galaxy shown in Fig. B.1, as extracted using a circular aperture with radius 1″ from the MUSE data. The red spectrum indicates the error vector. The vertical dashed blue line indicates the position of the only detected line emission (λ = 5435 Å). This galaxy is not associated to the quasar pair as there are no known strong line emissions at a rest-frame wavelength of ∼1800 Å. If this line is [O II]λ3729, this galaxy would be at z = 0.457 ± 0.001.

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