Quasar comoving emissivity at 912 Å (ϵ₉₁₂) vs. redshift (z). The small blue squares are taken from the compilations of Khaire & Srianand (2015) by integrating QLFs down to 0.01 L_*. The magenta open squares are our recalculations of their z > 4 points by integrating QLFs down to −18 mag and assuming a broken power-law quasar SED mentioned in the main text (i.e., same values used for the z ∼ 6.7 quasar emissivity measurement). The filled and open circles are our calculations at z ∼ 6.7 by using the single power-law QLF and double power-law QLF, respectively. Note that the open circles are shifted by 0.05 on the x-axis for clarity. The solid, dashed–dotted, and dashed lines are models from Haardt & Madau (2012), Khaire & Srianand (2015), and Madau & Haardt (2015), respectively.