Shapelet reconstruction of the source for four mock systems with a₄ = 0.05, 3000 s exposure time and a bright source. The displayed configurations are either fold configuration (left) or cusp_s configuration (right). The input lensing galaxy is either boxy (top) or discy (bottom). For each mock system, we consider two fitting setups: including shapelets in the source model with maximal polynomial order n_max = 5 or n_max = 8. The associated residuals and source shape reconstruction are displayed. For good models (i.e. χ² < 1.2), the morphology of the source gets less realistic as n_max increases.