Black hole mass and Eddington ratio space for non-BAL QSO (left panel) and BAL QSO (right panel). The space is divided into bins centred at Δlog M_• = [7.0,  8.0,  9.0,  10.0] and Δlog α_Edd = [ − 2.0,   − 1.0,  0.0]. The contours correspond to the full sample for each case, and the diamond symbols correspond to the median values of log M_• and log α_Edd in each bin. The number of sources, the ratio of non-BAL QSO (or BAL QSO) to the total sample size, and the median values of redshift, log L₃₀₀₀, log M_•, and log α_Edd are listed in each bin.