68% and 95% CL for the parameters w₀ and w₁ inferred from future (mock) observations. Solid lines present the constraints from H(z) data, dotted line from D_A(z) data, the cross marks the true value of w₀ and w₁ used to generate the data. The misalignment of distance-constraints is a result of not taking into account inhomogeneities. Left: the results of analysis within the non-linear Swiss-Cheese model (w₀ =  −1 and w₁ = 0). Middle: the results of analysis within the linear approximation scheme (w₀ =  −1 and w₁ = 0). Right: the results of analysis within the linear approximation scheme (w₀ =  −0.95 and w₁ =  −0.5).