Fig. 6
Constraints on p and RV as derived from the observed colours of SDSS QSOs and the measured dust column density at the angular position of each QSO. Solid colours correspond to 95.4% CL for two parameters. Top: results for CCM dust corresponding to 95.4% CL for one parameter of p = 0.0205 ± 0.0015 and RV = 3.10 ± 0.43. Bottom: results for Fitzpatrick dust corresponding to 95.4% CL for one parameter of p = 0.0190 ± 0.0015 and RV = 3.25 ± 0.37.
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