a–b: moment maps of SO of L1527. The white contours represent the continuum emission, with levels of [0.1, 0.5, 0.9] times the peak value. The black contours represent the integrated intensity of SO₂ 16_3,13 – 16_2,14, with levels of [8, 11] Jy beam^–1 km s^–1. The moment 0 map SO₂ is shown in Fig. B.3. In panel b, the beam is shown in the upper right corner by a gray ellipse, c: PV map of SO along the dotted black line in panel b. The solid white and dashed black lines denote the two linear structures on the PV map.