Notes. The base case has γ_ext = 0.05, q = 0.8, 5400 s exposure time, a very bright source (⟨m_QSO⟩ = 18.5 mag), and a₄ = 0.01 and is fitted without shapelets in the source. This setup appears at different places in the table; the corresponding rows are coloured in red and the results are also shown in Fig. 4. The differences between the base case and the others are indicated in the first column, the rows list the different modifications applied to the base case. The specifications in bold are changes made with respect to the model, while the other changes are specific to the mock-image creation. The 3000 s exposure time and bright source (⟨m_QSO⟩ = 20.25 mag) setup with a₄ = 0.01 is displayed at two rows in green, the related residuals are shown in Fig. 5. The same setup with a₄ = 0.04, with and without shapelet reconstruction is displayed in purple. The associated residuals are shown in Fig. 6. The uncertainties on H₀ are calculated using the 0.16 and 0.84 quantiles and the main value is the median of the MCMC H₀ sampling.