Modeling of C/2001 Q4 (NEAT) spectrum obtained on 2004 May 7 with a mixture of two different Boltzmann distributions, respectively 4200 and 600 K with proportions of 90 and 10%. The upper part represents the region around the (2,1) band, the lower part the region around the (1,0) band. The importance of (2,1) and NH₂ lines is shown by their respective spectrum. The relative brightness of NH₂ lines have been adjusted to fit the observational data as well as possible.