CCH column density and excitation temperatures from the two-component hfs fitting for clumps MM2, MM3 and C. White contours in the left panels represent the integrated intensity map of CCH l_1,1–0_1,1 line (85–100 km s⁻¹), from 3.3 K km s⁻¹ (7 σ) to 9.8 K km s⁻¹ (0.9 times the peak emission of MM2) with six uniform intervals. The gray and green contours and crosses follow the same definitions as in Figure B.1.