Instrument constraints

        "seeing":                     {"default": "2", "max": 2, "min": 0.2},
        "skyTransparency":            {"default": "Photometric", "list": ["Photometric", "Clear", "Variable, thin cirrus", "Variable, thick cirrus"]},
        "baseline":                   {"default": "D0-G2-J3-K0", "list": ["A0-G1-J2-J3", "A0-G1-J2-K0", "D0-G2-J3-K0", "A0-B2-C1-D0", "UT1-UT2-UT3-UT4"]}