Closed-loop Strehl ratio for the linear and nonlinear reconstructed when the ND5 filter is used, decreasing the flux level by a factor of 10³ (or a Δ mag = 7.5) compared to the data that were used to train the models. The different rows correspond to different values for the wind speed, while the columns show the performance for different seeing values. Videos of the closed-loop tests are available at online.