Fig. 3.
Average distance corresponding to nv. The distance is computed assuming ΛCDM, and the cosmological parameters are taken from the latest Planck results (Planck Collaboration 2018). “All sources (z)” sample contains 175 sources, all with redshifts and good polarization measurements. Of these 175 sources, 139 are quasars; 69 of these quasars are above a redshift of one.
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