Top: methyl formate intensity map integrated over the velocity (bandwidth of 25 km s⁻¹ around the 216.21 GHz transitions). The contours correspond to 3, 6, 9, 12, 24, 50, 100, and 200 σ, where the rms noise σ = 2.6 K km s⁻¹. Bottom: Methyl cyanide intensity map integrated over the velocity (bandwidth of 120 km s⁻¹ around the 91.97 (GHz transitions). The contours correspond to 5, 10, 20, 30, 50, 100, and 200 σ, where the rms noise σ = 83 K km s⁻¹. The red stars indicate the position of the hot cores identified on Fig. 2.