[O III] to UV luminosity ratio (L_O III/L_UV) plotted against the oxygen abundance relative to the sun ([O/H] = log₁₀(n_O/n_H)−log₁₀(n_O/n_H)_⊙). The hatched area shows the upper limit on z7_GSD_3811 based on our 3σ upper limit on the [O III] assuming a line-width of 100 km s⁻¹, while the yellow line shows the corresponding value if we assume a four times wider line. The dark gray diamonds show local dwarf galaxies from Madden et al. (2013), De Looze et al. (2014), and Cormier et al. (2015) compiled by Inoue et al. (2016).