Radial profiles of protostellar accretion disk models. Top panel: disk photospheric temperature for non-irradiated disk (lower solid line) and irradiated disk (upper solid line) for m_∗ = 10   M_⊙ with fiducial accretion rate. The equivalent models for m_∗ = 10   M_⊙ with accretion rate enhanced by a factor of 10 are shown by the dotted lines. The equivalent models for m_∗ = 20   M_⊙ with fiducial accretion rate are shown by the dashed lines. The long-dashed horizontal lines show the approximate range of temperatures where we consider there are contributions to the CO bandhead equivalent width. Bottom panel: Keplerian velocities for the m_∗ = 10, 20   M_⊙ models, shown by the solid and dashed lines, respectively.