Azimuthally averaged profiles of DCO⁺ (green) and C¹⁸O (gray) emission line fluxes from Favre et al. (2019). The profiles were normalized to have the same slope outside of the gap (120–250 au); the slope is shown in blue. There is an increase in DCO⁺ emission anda decrease in C¹⁸O emission intensity at the gap location in comparison with it. In the bottom left corner of the image, the beam size of 0.23″ is shown. The locations of the gaps are shown by the hatched boxes.