Dependence of the LyC escape fraction on the absolute magnitude M₁₄₅₀ for QSOs and AGNs at 3.6 ≤ z ≤ 4.2. Squares show the targets observed with the VLT telescope, triangles are the AGNs observed with MODS1–2 at the LBT telescope, while pentagons are the AGNs observed with the LDSS3 instrument at the Magellan-II Clay telescope. The uncertainties on the measured LyC escape fraction at M₁₄₅₀ ≳−25 are of a few percent (~2–15%). The two asterisks connected by an horizontal line show the range of M₁₄₅₀ for the QSOs studied by Cristiani et al. (2016), while the three stars are three very bright QSOs (M₁₄₅₀ ~ −30) studied by Sargent et al. (1989, S89). No obvious trend of f_esc with the absolute magnitude M₁₄₅₀ is detected.