Change in warm methanol mass with disk radius (left panel), envelope mass (middle panel), and luminosity (right panel). The dashed lines show the envelope-only models, and the solid lines show the envelope-plus-disk models. The fiducial models are indicated by a cross. The warm methanol mass is computed inside the methanol snow surface where the methanol abundance is higher than 10^–9 in the envelope and higher than 10^–11 in the disk (i.e. the methanol mass in D_in and E_in in Fig. 2) for models with low mm opacity dust grains (green) and high mm opacity dust grains (orange). In the models in which R_D is varied, luminosity and mass of the envelope are fixed to 8 L_⊙ and 1 M_⊙. The dashed lines are constant in the left panel because the envelope-only models do not have a disk for which its radius can be altered. Where M_E is varied, the luminosity, disk mass, and radius are fixed to 8 L_⊙, 0.01 M_⊙, and 50 au. Where the luminosity is varied, the envelope mass, disk mass, and radius are fixed to 1 M_⊙, 0.01 M_⊙, and 50 au.