Integrated intensity contours maps of the C₂H (1_1.5,2−0_0.5,1) emission, on the left, and the HC₃N (11−10) emission, on the right. The beam of each line is displayed in the lower left corner of each panel. The three brightest peaks of the SO (23−12) integrated map are shown by black triangles, whose size depends on their intensity relative to the overall maximum. The primary and the secondary axis are represented by the grey dashed-lines. Left: C₂H (1_1.5,2−0_0.5,1) blue-shifted emission (5.01–7.35 km s⁻¹) in blue contours and red-shifted emission (7.75–9.72 km s⁻¹) in red contours. The levels are 10σ to 33σ by 3σ steps where σ = 0.97 mJy beam⁻¹ km s⁻¹. Right: HC₃N (11−10) blue-shifted emission (4.75–7.24 km s⁻¹) in blue contours and red-shifted emission (7.77–9.49 km s⁻¹) in red contours. The contour levels are 7σ to 19σ by 2σ steps where σ = 0.89 mJy beam⁻¹ km s⁻¹.