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Fig. 3


Left: reconstructed (grayscale) and observed (contours) CO(4 → 3) surface brightness observed with ALMA. Right: CO(4 → 3) velocity map of the Ruby. We label the two sets of multiple images; we show the tangential and radial critical curves at z = 1.525 and caustic lines at z = 3.005 as orange and blue lines, respectively.

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