Reconstruction of the CO (2-1) emission for our 8 velocity channels. From left to right are shown the dirty image of the data, the dirty image of the best model (normalised to the peak of the dirty image data), the residuals of the data-model, the best image-plane model and the best source-plane model (in units of mJy km s⁻¹ arcsec²). The white lines denote the critical lines and caustics in the image plane and the source plane, respectively. The axis coordinates are in arcsec with respect to the ALMA phase-tracking centre. The spatial scale in the source plane (right panels) is 1′′ = 7.030 kpc.