Left: Flux from the full data cube integrated across 1.38–1.44 μm. The emission-line region apertures from Figure 1 are included for reference (green). A fifth aperture (black) marks the additional source 0$\stackrel{″}{.}$81 to the north-north-west of the quasar. Right: Spectrum integrated over the black aperture in the left panel (blue). Three clear emission lines are seen at 0.85 μm, 1.07 μm, and 1.40 μm. The 0.85 μmline is contaminating Lyman-alpha flux from the nearby quasar (grey shaded wavelengths). There are two potential redshift solutions for the 1.07 μm and 1.40 μm emission lines: z = 1.135 for the [O III] λ 5007 and Hα emission lines (dashed grey lines) or z = 7.018 from [C II] λ1334 and N III] λ1747. The green dashed line marks the Lyman-α redshift at z = 7.018, below this in the green shaded region we would expect no flux for a high-z galaxy. In fact, this region shows significant continuum flux, suggesting that the source is at z = 1.135.