Top and bottom panels: CO(2-1) extracted spectra of NGC 4253 (distances from the AGN are given in the top left or top right boxes of each panel). We extracted the spectra with an aperture equal to the beam size except for the first and last spectra, which are integrated on a circular aperture of radius 05. Middle: CO(2-1) integrated intensity contours overlaid on the mean velocity residual map. Lines of the spectra are as in Fig. 3 and CO(2-1) integrated intensity contours are as in Fig. 8.