Non-LTE results of the AS 205 (N) model comparing results with large grains (solid line) to ISM grains (dashed line). a) R(6) 10⁰0–00⁰0 line at 3 μm and b) the total HCN emission between 13.7 and 14.1 μm. The adopted opacities are shown in Fig. A.1. The HCN fractional abundance is constant in the disk (x_in = x_out) and varied between 10^-9 and 10^-6. 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.