Width and position of the observed 69 μm bands relative to each other. Blue, red, teal and green curves correspond to mass loss rates of 1 × 10^-5 M_⊙/yr, 5 × 10^-5 M_⊙/yr, 10 × 10^-5 M_⊙/yr and 15 × 10^-5 M_⊙/yr, respectively. The circle, triangle and square are for superwind radii of 200, 500 and 2500 AU, respectively. All other model parameters are listed in Table 3. The width and position of the observed 69 μm bands are plotted with black dots. Gray solid and dashed lines are as in Fig. 7.