Spectral profiles for NH₃ inversion transitions (6,6), (7,7), (9,9), (10,10), and (13,13) observed toward NGC 7538 IRS1 with the JVLA B-Array. The upper panel is showing the spectra integrated over the core component of the 1.3 cm continuum emission (see Fig. 1), and the lower panel the spectra integrated towards the southern spherical component. An offset in flux density was applied to better evidence their spectral profiles. The velocity resolution is 0.4 km s^-1 and the l.o.s. velocities are with respect to the local standard of rest (LSR). The dashed green (at −59.4 km s^-1) and red (at −58.2 km s^-1) lines indicate the central velocity of the least, (6,6), and most, (13,13), excited transitions, respectively, determined by fitting a single Gaussian to the transition spectral profile. In the southern component only the (6,6), (7,7), and (9,9) lines are clearly detected. The upper state energy levels of transitions shown here are ≈408–1693 K.