Integrated intensity of the CO line superimposed on the HST scattered emission (Clampin et al. 2003). The cross indicates the position angle and aspect ratio as determined from gas modelling (Sect. 3). Left: 12CO J = 2 → 1 emission, the contour spacing is 6σ, i.e. 5.5 × 10−1 Jy beam−1 km s−1. Beam size: 2.48 × 1.45′′. Right: 13CO J = 2 → 1 emission, with a 3σ contour spacing, i.e. 7.8 × 10−2 Jy beam−1 km s−1. Beam size: 1.76 × 1.32′′.
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