Measured (color arrows) and best-fit model (black arrows) 3D velocity vectors of CH₃OH masers. We show projections onto the equatorial plane of the envelope (upper panel) and a plane containing the l.o.s. and the outflow axis (lower panel). We assumed an outflow axis lying on the plane of sky (we obtained qualitatively the same picture by assuming an outflow inclination angle of 25°). The modeled infalling envelope has a radius of 0.′′16 (or 290 AU) and an infall velocity of 5 km s^-1. The dotted lines indicate concentric circles at steps of 10% of the radius (0.′′016) around the protostar at the (0, 0) position.