Fig. 5
Observed fluxes for the quasars from Table C.1 (small black dots) and sensitivity limits of the major surveys used for the present study (filled symbols) and for the IRAS Faint Source Catalogue (open squares). Star symbols and dashed curve: J220445.27+003141.8; dotted curve: J220445.27+003141.8 shifted by 1.5 dex downwards.
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