Notes. Predictions of the gas terminal expansion velocities (TEV) obtained from MIRO and DSMC simulations. For MIRO observations, TEV values are retrieved from spectral lines for each isotopologue using a neural network approach (Rezac et al. 2021). For DSMC simulations, the value for each dust layer model is obtained directly from the velocity field (through the LOS) and does not depend on the isotopologue.