68% and 95% contour plots for the two parameters { μ₀−1,η₀−1 } obtained by evaluating Eqs. (46) and (47) at the present time when no scale dependence is considered (see Sect. 5.2.2). We consider both the DE-related (left panel) and time-related evolution cases (right panel). Results are shown for the scale-independent case (c₁ = c₂ = 1). In the labels, Planck stands for Planck TT+lowP.