BH masses in BH-BH mergers within the design advanced–LIGO horizon (z <  2) for models M60.B (strong pair-instability pulsation supernovae), M70.B (moderate PPSN), and M30.B (weak PPSN). Top panel: distribution of individual BH masses, bottom panel: total BH-BH system mass. All distributions are intrinsic (neither redshifted nor weighted by detection probability). For comparison, we also indicate the range of LIGO/Virgo O1/O2 mean mass estimates and their most narrow and the widest allowed range within 90% confidence limits. Individual BH masses may reach ∼40 M_⊙ (M60.B) and ∼55 M_⊙ (M30.B), while the total BH-BH mass may reach ∼80 M_⊙ (M60.B) and ∼110 M_⊙ (M30.B). Note that these distributions only very approximately resemble power-laws: ∼M^−3.6 (for individual BH masses) and ∼M^−4.0 (for total BH-BH mass). Power-law fits (dashed black lines) were performed for model M30.B in the log-log space.