Illustration of residuals from the galaxy modelled with the predicted parameters by the different software packages. The plot has the same structure for the three types of simulations (single-Sérsic in the first three rows, double-Sérsic in the three middle rows, and realistic galaxies in the last three rows). For each type, the first row presents a bright galaxy, the second an intermediate galaxy, and the third a faint one). In the two first columns, we show the actual image of the galaxy, with and without noise. Then, each pair of columns presents: (1) the noiseless model constructed from the predicted parameters of each code, and (2) the residual between the noisy true galaxy and the noise-less model. All the colour bars are related to the Euclid Wide Survey noise level. For this reason, a perfect model would lead to a colour bar ranging from −3σ and 3σ. Finally, to better capture the details of the residuals, we clipped the value to a certain σ value, which is fixed for all the codes and magnitudes in a certain type of simulation. For the residuals, the colour bar is symmetric, centred on zero.