[OIII] 5008 Å MaNGA observations and models of two discs, superimposed on the MegaCam r-band image. MaNGA pixels encompassing the centre of the discs are shown. Fits are done on original MaNGA spaxels but for the figure, MaNGA spectra and our fits are binned 16 by 16 and shown in brown boxes encompassing these binned spaxels. The velocity axis of each box is from -800 to 800 km/s. The two same ticks for values 0, on the baseline of spectra, and 0.01, are shown on the left and right y axes of each box, to show the scale which is adapted to each box. The Gaussian reconstructed MaNGA PSF is shown on the bottom-right. The outermost contour of NOEMA CO(1–0) intensity is shown in blue.