Constraints in the (w₀, w_i) and (Δ, w_i) planes (left and right panels, respectively) for the three-parameter Model L. The top panels correspond to a uniform prior on w_i, while the bottom ones correspond to a uniform prior on log₁₀(1 + w_i). In all cases the black contours denote the one, two and three-sigma confidence levels, while the colourmap depicts the reduced chi-square of the fit for each set of model parameters (dark red corresponds to a reduced chi-square of 1.5 or larger).