Brγ differential interferometric observables of DO Tau: squared differential visibilities (left) and differential phases (middle) for the six color coded interferometric baselines depicted in the (u, v) plane (upper-right); line-to-continuum flux ratio in the reference frame of the star, LSR-and tellurics-corrected (lower-right). For the interferometric observables, the plots give the median value over the whole observing sequence. Gray shaded regions correspond to the velocities that are not considered for our Brγ line analysis.