Top panel: CFHTLS g-band image of SL2S J08591−0345 showing the slit position over arc A (see also second row, left panel in Fig. 8). Middle panel: observed spectrum of arc A (black continuous line). In red we depict a starburst template from Kinney et al. (1996) shifted at z = 0.883. Some emission lines are identified, e.g., [OII]λ3727, H_γ, and H_β. Bottom panel: two-dimensional spectra of the same arc. We note the [OII]λ3727 and H_β emission lines.