2D contours on Ω_m, 0, ϵ₀ and ϵ₁, using the combination of BAO and SnIa dataset given by currently available data (red contours), LSST supernovae and Euclid BAO data (yellow contours), and the combination of LSST supernovae with BAO forecasts coming from the combination of Euclid and DESI (blue contours). These results refer to the constant (top panel) and binned (bottom panel) ϵ(z) cases. The dashed lines identify the limit ϵ(z) = 0.