Comparison between the observations by Qiu et al. (2009) and the predictions from our wind-driven turbulent entrainment model. The upper left panel shows the morphology of the outflow observed by Qiu et al. (2009), the lower left panel shows the position-velocity structure of the observed outflow. The upper right panel shows the morphology of the outflow from our modelling, the lower middle panel shows the position-velocity structure of our outflow model cut along its major axis. The outflow model has a mass-loss rate of 1.0 × 10^-3  M_⊙yr^-1 and an inclination angle of 50°. For both the observations (lower left panel) and our modelling (lower right panel), the U-shaped region is the region in the position-velocity diagram where the structure of the outflow exhibits a U shape, the Low-v gas region is the region where the gas has a relative small velocity at regions far from the protostar, and the High-v gas region is the region where the gas has a relatively high velocity in the close vicinity to the protostar.