True versus predicted Kron magnitudes m_F160W plots (upper panel) and residuals (lower panel) for 222 spectroscopic cluster members. The predicted values were obtained using two linear regressors trained using Kron magnitudes, m_F110W and m_F814W, (red and blue points, respectively). The brown dash-dotted line indicates the magnitude threshold used to select the cluster members sample used for the strong-lensing model. The table shows various statistical indicators for the best and worst regressor, considering all the values (first and third column) or only the objects for which m_F160W ≤ 21 (second and last column).