Synthetic line profiles (blue) superimposed on observed line profiles (black) of HCN (left panel) and CH₃OH (middle and right panels). The inserts in the upper right of the plots show the assumed geometry of the outgassing with respect to the Sun direction, with the production rates given in units of 10²⁵ molec. s⁻¹ for HCN, and in units of 10²⁶ molec. s⁻¹ for CH₃OH. The assumed expansion velocities (km s⁻¹) in the sunward and antisunward hemispheres are also indicated. Thermal broadening assuming a kinetic temperature of 60 K (see main text) is considered.