GA reconstructions of the null tests mentioned in Sect. 3 using the Euclid + DESI BAO and Euclid + LSST SNe data for the CPL mock for (w₀, w_a) = (−0.8, −1). In all cases, the dashed line corresponds to the fiducial value of the corresponding test for CPL, the red line is the GA fit, the blue line is the PA fit, the shaded regions correspond to the 68% uncertainties, and the black points correspond to the binned Euclid and DESI mock data. The vertical dashed line at z = 0.9 indicates the minimum redshift of the Euclid-only points.