NH₃ spectra of ISOSS23053. Left-hand side: NH₃(1, 1) spectra, and right-hand side: NH₃(2, 2) spectra. Top two panels: Effelsberg 100 m observations, central panels: combined VLA and Effelsberg 100 m spectra at the position p1, and bottom panels: combined VLA and Effelsberg 100 m spectra at the position p2. The red line corresponds to the fit. Since we do not observe the hyperfine structure of the NH₃(2, 2) transition, we show a Gaussian fit to the main component. The fit parameters and coordinates of the spectra are given in Table A.1.