GET /api/isotopologue_12c18o/?format=api
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Vary: Accept

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        "lower_level_energy": 5983.87,
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        "upper_level": "(v=3) R-branch (J=0)",
        "lower_level": "(v=3) R-branch (J=0)",
        "transition": "v3-3 R-0",
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        "lower_level_energy": 8921.47,
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]