First two rows: maps of the integrated intensity of the CCH  (262.004  GHz) and c-C₃H₂  (217.822  GHz) lines, and of the column density and rotation temperature derived by applying the rotational diagram technique to each pixel. Black contours indicate the CCH 3–2 integrated intensity, and go from 5  K  km   s^-1 to 20  K  km   s^-1 in linear steps of 2.5  K  km   s^-1. The position of the infrared sources IRS1/2/3/4 (Henning et al. 1992) and the MP2 position (Ginard et al. 2012) are shown as black triangles. All the maps have been convolved to a spatial resolution of 29′′. Bottom row: CCH and c-C₃H₂ abundance maps, obtained using C¹⁸O as a reference and assuming ¹⁶O/¹⁸O = 500 and a CO abundance of 5 × 10^-5 relative to H nuclei. The N(c-C₃H₂)/N(CCH) ratio is also shown.