Oral title: Late stages of gas dissipation in the mutliple-ring, hybrid disk HD141569

Oral abstract: The study of gas-rich debris disks is fundamental to characterize the transition between protoplanetary disks and 
debris disks.  We present new IRAM/NOEMA and ALMA resolved observations of the brightest hybrid disk HD141569A. We model 
multiple transitions of 12CO and 13CO, and constrain the distribution and the excitation conditions of the residual gas in this 
multiple dusty rings system.