Figure 5.

Relationship between peak optical thickness and wavelength for a set of isothermal-isobaric fine-structure models. Each colour corresponds to an isothermal temperature (K), as described in the colour bar to the right. Each symbol corresponds to an isobaric pressure ($\text{dyn}{\text{cm}}^{-2}$), as described in the legend. The red-dashed line shows the transition between optically thick and optically thin emission. The two grey-shaded areas depict ALMA observing Bands 6 and 3.