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Fig. 3

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C/O ratio and [(C+O)/H] of a planet with a mass and orbital distance of WASP-77Ab formed in a disk of a solar composition (blue) and similar composition to WASP-77A (purple). Solid lines indicate the solar [(C+O)/H] and C/O ratio. The observed C/O ratio and [(C+O)/H] of WASP-77Ab and their contours are shown in red.

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