Fig. 3
Errors of Ma) and Lbolb) as a function of redshift z for the 105 quasars from Shen et al. (2011). Polygon: mean values in narrow z bins. Bottom c): z distribution of the quasars from the variability sample from Paper I. Vertical lines: z interval of the final quasar sample. For reasons of clarity, we refrain from plotting very large errors in a) and b).
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