Effect of continuum over-subtraction in the fiducial envelope-plus-disk model with large κ_dust at mm. Orange shows a radial cut through the methanol emission image including dust continuum at the line peak (0 km s^–1). Green shows the same without dust in the model (true line intensity). Blue shows the same as orange but continuum subtracted. There is a difference of a factor of about four to up to an order of magnitude between the continuum-subtracted intensity and the true line intensity due to the continuum over-subtraction effect.