Streamline model that best fits the observed blueshifted envelope component in H₂CO line emission. In both image and velocity space, the black curve represents the streamline model solution that best describes the bulk motion of the streamer. Left: peak main beam temperature T_peak for each pixel in the blue component found with DBSCAN. The blue and red arrows show the direction of the blue and red outflow lobes from Zapata et al. (2014), respectively. The black ellipse in the bottom left corner represents the beam size. The black star represents the position of the protostar. The black dashed circle represents the size of the primary beam. Right: central velocity KDE for the blueshifted envelope plotted against the projected distance from the protostar.