RATRAN models of CH₃OH (red) and IRS7B ALMA spectral window 1 spectrum smoothed to 1.1 km s^-1 channels (blue). The density profile follows a −1.5 power law at r > 100 AU in all models. In Models 1–2 it follows this power law at all r. In Models 3–4 it is flat for r< 100 AU. The CH₃OH abundance is constant at 10^-10 in Model 1. In the remaining models, it has a break profile at T = 100 K, with an inner CH₃OH abundance of 10^-8. The outer CH₃OH abundance is 10^-10 in Models 2–3 and 10^-12 in Model 4. The model parameters are also found in Table 4.