Models that provide an acceptable fit to the observed CO line profiles (solid lines). The grey region indicates the region over which the values of gas temperature and density as a function of radius can vary in the context of our model and still fit the data. The dashed black line indicates the density of an outflow with a constant velocity of 5.5 km s⁻¹ and a mass-loss rate of 10⁻⁷ M_⊙ yr⁻¹. The dotted lines represent the limits of the range explored in the grid calculations for the temperature and density profiles.