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Fig. 2.
13CO emission is shown in the colour map and contoured at levels of (3,4,5,6)×σ13, with σ13=0.040 Jy km s−1 beam−1. The red ellipses show the position of the HST rings with parameters from Biller et al. (2015). The black ellipse shows the location of the mm ring detected in the 1.3 mm continuum image.
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