Non-LTE results of the AS 205 (N) model comparing different abundances inside (x_in) and outside (x_out). a) R(6) 10⁰0−00⁰0 line at 3 μm and b) the total HCN emission between 13.7 and 14.1 μm. The outer abundance is scaled for the gas-to-dust ratio (G/D) and takes 3 different values (e.g., 10^-9, 10^-8, and 10^-7 for G/D = 100). Three different gas-to-dust (G/D) ratios of 100 (red), 1000 (green), and 10 000 (blue) are shown. The fluxes observed by Salyk et al. (2009; 14 μm) and Mandell et al. (2012; 3 μm) are given in black dashed lines.