Fig. 6.

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H0 and Ωm constraints from our models in flat ΛCDM cosmology, for the IDEAL (left) and FIDUCIAL (right) datasets with statistical uncertainties of δvstat = 2.5%. We adopted uniform priors on H0 of [50, 120] km s−1 Mpc−1 and Ωm of [0.05, 0.5]. The green shaded regions show the 1σ, 2σ, and 3σ confidence regions based on the constraint on DΔt only, i.e. P(DΔt) after marginalising over other mass model parameters, including Dd. The red shaded regions show the corresponding constraints based on P(Dd), after marginalising over DΔt. The grey histogram shows the constraints based on P(Dd, DΔt); we have omitted the 2D contours for ease of viewing. Different tilts in the H0–Ωm space, when marginalised over Dd and DΔt, respectively, can break some of the degeneracies, also leading to improved constraints on Ωm.
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