Contours: CO (2–1) red- (dashed) and blue-shifted emission (solid) at ± 12 km s⁻¹ from the systemic velocity − 17.4 km s⁻¹. Contour levels are − 6, 6, 18, 30, 50, 70 times the rms level 0.04 Jy beam⁻¹. The synthesized beam located in the bottom-right corner is 1′′66 × 1′′38, PA = − 8°. Color scale: intensity-weighted averaged velocity (i.e., moment 1) map of H₂CO 3(0,3)–2(0,2) emission. A scale bar is located in the bottom-left corner.