Fig. 3
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Radial profiles of 12CO/13 CO intensity ratios for HD 9672, HD 32297, HD 121617, HD 131488, and HD 131835 (blue). The 12CO radial profile is overplotted in red to show the gas distribution in each system. The 12CO/13CO ratios for HD 32297 and HD 131488 (marked by an asterisk) were created from the average of the non-deprojected on-sky radial profiles. In each panel, the minimum value of R corresponds to the first resolution element of the observations. The black bar indicates the resolution of the observations.
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