Top Panel: CH₃COOH channel emission maps at 219 016 MHz. Bottom Panel: spectra centred at 219 016 MHz. The black spectrum is taken in direction of the EGP emission peak while the blue one is taken in direction of the northwest clump which contaminates the CH₃COOH emission maps displayed here as well as in Fig. 1. The red dashed line shows the 3σ noise level of the spectrum taken in direction of the northwest clump.