Keplerian masked spectrum of ¹³CO J = 6−5 (blue) and ¹³CO J = 2−1 (orange) of the LkCal5 (left) and HD 169142 disk (right). The shaded area indicates the 1σ uncertainty on the spectra. The vertical dotted black line in the HD 169142 panel indicates the bump in the spectrum corresponding to the inner ring at 17 AU seen in the azimuthally averaged radial profile of the ¹³CO J = 6−5 transition. We note that for S/N considerations, we show the ¹³CO J = 2−1 data at intermediate spatial resolution for LkCal5. The spectrum of the ¹³CO J = 6−5 transition for LkCal5 is obtained from the combined data sets.