Ammonia spectra for cores #1 to #5 and #7, as indicated in the top-right corner of each frame. In each panel, the top spectrum is the NH₃ (1,1) spectrum shifted by 1 K. The orange line shows the CLASS hyperfine best fit obtained. The bottom spectrum is NH₃ (2,2) spectrum. The blue line shows the Gaussian best fit. The best-fit centroid velocity, peak T_mb, FWHM, and S/N are included for both transitions. The grey parts of the spectra were outside the analysed velocity range, which were defined around the v_Isr(1,1) and v_Isr(2,2) values.