Mock binned lensed kinematic data of the source galaxy of RX J1131−1231. We scale the signal of the source galaxy to obtain a signal-to-noise ratio in the brightest pixel of 15, to mimic a realistic scenario (see Sect. 3.1.2 for further details). The data are binned to obtain a signal-to-noise in each bin of 20. We obtain a total of 45 bins. The pixel resolution of the kinematic map is 0.1″. The masked black region corresponds to regions in the image plane which have no correspondence on the source plane. The yellow cross marks the lens centroid position.