Bolometric luminosities vs. black hole masses for the sample of X-ray emitting type 1 AGN, divided in intervals of redshift (z ≤ 0.8, black open circles; 0.8 < z ≤ 1.3, blue open stars; 1.3 < z ≤ 1.8, red filled triangles; z > 1.8, green crosses). Only mean error bars are reported to avoid clutter. Grey dashed and dotted lines define the locus for sources emitting at the Eddington limit and at 1/10 of it.