Simulated HST data. The lens light is assumed to be perfectly subtracted. The resolution and noise covariance mimic those of real observations with the WCF3/F160W instrument. First row: simulation using a single galaxy. Second row: more complex configuration with a composite of three close-by galaxies in the source plane. Source objects are projected on a finer grid, to match the resolution of our reconstruction technique (https://github.com/aymgal/SLITronomy-papers/blob/master/paper_I/mock_source_reconstruction.ipynb).