Selection function of our z ∼ 7 quasar survey. The probability is the fraction of simulated quasars selected by our selection criteria among all simulated quasars in each (M1450, z) bin. The orange filled stars denote newly discovered quasars reported in this work, and blue open stars are previously known z > 6.45 quasars. The contours are selection probabilities from 0.7 to 0.1 with an interval of 0.2.