Schematic illustration of the different elements present around Per-emb-50. The streamer is represented as a thick light-blue line. The inner envelope is represented in light pink and the rotating gas disk is represented with a green ellipse. The inner envelope has a transparent gap inside to see the streamer behind it. The blue and red straight arrows show the outflow direction in the blueshifted and redshifted directions, respectively. The white circle shows the dust disk and the solid black ellipse marks its edge. The dashed circle represents the centrifugal radius. Curved arrows show the general direction of motion of each component: red and blue arrows show if the motions are seen as redshifted or blueshifted line emission, respectively. a: image plane view, where the right ascension increases toward the left and declination increases upward. b: line-of-sight view, where the observer is on the left and distance increases toward the right.