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Fig. 10.

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L5100 Å vs. log(L3μm/L5100 Å). QSOs from K13 are included in the plot as gray dots, and their median values over bins of width 0.15 dex are portrayed as black circles. The black dashed line gives the best fit obtained assuming the function described in Sect. 5.4.2. WISSH QSOs are depicted as green squares; the black square shows their median value.

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