Relative residuals – Comparison of different methods to reconstruct cluster potentials. With the polytropic stratification assumption (this work): the X-ray potentials (in blue), the tSZ potentials (in black contours), and without the polytropic stratification assumption (in red, Lau 2011). We show the results for the HE mass for comparison (in hatched green). The X-ray and tSZ potentials have been reconstructed for uncertainties on Γ of a few per mill.