Images and spectra of all targets in the analysed sample. Each row refers to a system in the sample. The first columns show the continuum images with the names of the targets indicated in the top left. The second, fourth, and sixth columns show the zeroth moment images for the ¹²CO, the ¹³CO, and the C¹⁸O emission, respectively, scaled so that the maximum is equal to the peak flux and the minimum is clipped at the image rms. The third, fifth, and seventh columns show the first moment images (calculated through the bettermoments tool) for the ¹²CO, ¹³CO, and C¹⁸O emission, respectively, scaled so that the maximum and the minimum are equal to the systemic velocity of the target ±2 km/s. The FWHM beam size is shown in the bottom left of each panel. All bars in the bottom right of each panel are 0.″5 long. The last two columns show the ¹²CO and ¹³CO spectra of the circumprimary (red), circumsecondary (blue), and circumtertiary (green) discs (when applicable), with vertical black lines showing the systemic velocities fitted with the eddy tool and grey band showing the excluded absorbed velocities in eddy fitting on circumprimary disc rotation maps (see Table 4).