Gas velocity components in units of the local isothermal sound speed at r = 8.3 au at time t = 120 yr, in the rotated frame (as in Fig. 24-right). The colors are linear between −1 and 1, and logarithmic for |υ/c_s| > 1. Note: the isothermal sound speed c_s is constant at 0.66 kms⁻¹ throughout each panel, consistent with a disk aspect ratio of h_p/r = 0.064. Left: Radial velocity (sloshing motion). Right: Vertical velocity (breathing motion). The dot-dashed, dashed and dotted grey lines mark the rms vertical extend of the disk (which would relate to the pressure scale height in a steady-state disk), twice that, and three times that. The grey areas below and above are the regions outside the model grid.