(a) Moment 1 map of H₂CO line emission from ACA observations shown in color. The corresponding integrated intensity map is shown in contours. Contour levels are [0.2, 0.4, 0.6, 0.8]  ×  7.97 Jy beam⁻¹ km s⁻¹. (b) Moment 1 map of H₂CO line emission from ACA+TM2 observations shown in color. Contours show the integrated intensity map. Contour levels are [0.2, 0.4, 0.6, 0.8]  ×  0.398 Jy beam⁻¹ km s⁻¹. (c) Moment 1 map of H₂CO line emission from ACA+TM2+TM1 observations shown in color. Contours show the 1.3 mm continuum emission. Contour levels are [0.05, 0.1, 0.2, 0.4, 0.6, 0.8]  ×  42.7 mJy beam⁻¹. Panels (d), (e), and (f) show the velocity profiles along the dashed lines in the corresponding left panels. Red lines indicate linear fits.