Warm methanol mass (left) and integrated line flux of methanol (right) for envelope-only fiducial models with different luminosities and carved HC or UC HII regions. Green and orange show low and high mm opacity dust models. Dashed lines show when the size of HII region is 1000 au, dashed dotted lines show the same for 5000 au, and the dotted lines show the same for 10 000 au. An HII region of size ~10 000 au is needed for a drop of ≳2 orders of magnitude in methanol emission.