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We present high resolution ALMA observations of the CO(3-2) and 350 GHzcontinuum emissions of the debris disc of 49 Ceti, known to be particularlyrich in molecular gas in spite of its age. The main new results are: i) both COand dust discs share a same position angle and a same inclination but the gasdisc is more homogeneous, more central and thinner than the dust disc; ii)evidence is obtained for a significant deficit of observed CO(3-2) emission atDoppler velocities differing from the star systemic velocity by less than 1\kms; iii) gas velocities are accurately measured and found Keplerian over abroad range of disc radii; iv) the observed CO(3-2) line width is dominated byKeplerian shear and upper limits are obtained to the intrinsic line width.Simple phenomenological models of both CO(3-2) and \mbox{350 GHz} continuumemissions are presented, requiring the use of only very few parameters. Theresults are discussed in the frame of currently favoured models.

High resolution ALMA observation of the $^{12}$CO(3-2) and 350 GHz continuum emissions of the debris disc of 49 Ceti