X-ray to UV slope α_OX as a function of L₂₅₀₀ for quasars at z >  5.7. Because of its strong X-ray emission, J0921+0007 (pink square) deviates significantly from the α_OX-L₂₅₀₀ relation, the 1σ confidence interval of which is delimited by the dotted red lines (Nanni et al. 2017). The sensitivity of eFEDS to sources modelled by a steep absorbed power law (Γ = 3 and N_H = 3 × 10²⁰ cm⁻²) is traced by the colour map. The hexagonal pattern represents a sample of XMM-detected SDSS quasars presented by Lusso & Risaliti (2016).