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Fig. 1


GTC-OSIRIS spectra of SDSS J1339+1310ABG in 2014. The fluxes from the R500R (27 March) and R500B (20 May) grism data are depicted with bright and light colours, respectively (A in red, B in blue and G in green). Vertical dotted lines indicate emission lines at zs = 2.231, while grey highlighted regions are associated with atmospheric artefacts.

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