Deprojected azimuthally averaged radial profiles of the brightness temperature of the ¹³CO J = 2−1 (orange) and ¹³CO J = 6−5 (blue) transition in LkCal5 (left) and HD 169142 (right). The dashed lines show them at a spectral resolution of 0.5 km s⁻¹ (LkCal5) and 0.44 km s⁻¹ (HD 169142). The solid line shows the ¹³CO J = 2−1 transition at the native spectral resolution of 0.17 km s⁻¹. The difference between the solid and dashed orange lines is due to the spectral resolution as the cubes are convolved to a beam of ~ 0″.17 × 0″.13 (−13.7°) (LkCal5) and 0″.057 × 0″.054 (88.6°) (HD 169142), respectively. The vertical black lines indicate the rings seen in the Band 9 continuum, and the light blue region starting from 0 AU indicates the gas cavity. The MRS of the HD 169142 J = 6−5 data corresponds to a radius of 35 AU.