GLASS spectra of the confirmed Lyα emitter at z = 6.76, RXJ1347_01037, described in Section 7.1 and presented by Huang et al. (2015). The white circles in the G102 spectra mark the position of Lyα. The central white circles in the G141 spectra mark the position of [O III] λ5007, if the line was [O II] λ3727 at z = 1.35. The lack of [O III] emission supports the interpretation that the G102 emission line is Lyα, given that a low-metallicity object at z = 1.35 would have [O III]/[O II]﹩\;\gt \;1﹩. The left- and rightmost white circles in the G141 spectra mark the location of C IV λ1549 and C III] λ1909 at z = 6.76, respectively. We do not detect any significant C IV and C III] emission from this object with line ratio limits of ﹩{f}_{{\rm{C}}{\rm{IV}}}/{f}_{\mathrm{Ly}\alpha }\lesssim 0.36﹩ and ﹩{f}_{{\rm{C}}{\rm{III}}]}/{f}_{\mathrm{Ly}\alpha }\lesssim 0.25﹩.