Constraints on ε when assuming different cosmologies: a flat ΛCDM on the left and fixed q = 1 on the right. Red points are obtained when using a template ξ^rr (and match the red points in Fig. 9), while the green ones are obtained when ξ^rr is taken from data. The x-axis shows the ε corresponding to the fiducial cosmology, while the y-axis is the best fit. The diagonal black line represents the point where the best-fit ε matches the fiducial one.