{
  "Wavelength": [
    "Radio",
    "IR",
    "optical",
    "UV",
    "EUV",
    "X-ray",
    "Gamma-ray"
  ],
  "Astronomy": [
    "Abundances",
    "Ages",
    "AGN",
    "Associations",
    "Atomic_Data",
    "Binaries:cataclysmic",
    "Binaries:eclipsing",
    "Binaries:spectroscopic",
    "BL_Lac_objects",
    "Blue_objects",
    "Clusters_of_galaxies",
    "Constellations",
    "Diameters",
    "Earth",
    "Ephemerides",
    "Equivalent_widths",
    "Extinction",
    "Galaxies",
    "Galaxies:Markarian",
    "Galaxies:spectra",
    "Globular_Clusters",
    "Gravitational_lensing",
    "HII_regions",
    "Interstellar_Medium",
    "Magnetic_fields",
    "Masers",
    "Masses",
    "_META_",
    "Models",
    "Multiple_Stars",
    "Nebulae",
    "Nonstellar",
    "Novae",
    "Obs_Log",
    "Open_Clusters",
    "Orbits",
    "Parallaxes",
    "Photometry",
    "Photometry:intermediate-band",
    "Photometry:narrow-band",
    "Photometry:surface",
    "Photometry:wide-band",
    "Planetary_Nebulae",
    "Planets+Asteroids",
    "Polarization",
    "Positional_Data",
    "Proper_Motions",
    "Pulsars",
    "QSOs",
    "Redshifts",
    "Rotational_Velocities",
    "Seyfert_Galaxies",
    "Spectral_Classification",
    "Spectrophotometry",
    "Spectroscopy",
    "Stars",
    "Stars:early-type",
    "Stars:Emission",
    "Stars:late-type",
    "Stars:peculiar",
    "Stars:variable",
    "Stars:white_dwarf",
    "Stars:WR",
    "Sun",
    "SuperNovae",
    "SuperNovae_Remnants",
    "Velocities",
    "YSOs"
  ],
  "Mission": [
    "AKARI",
    "ANS",
    "ASCA",
    "BeppoSAX",
    "CGRO",
    "Chandra",
    "COBE",
    "Copernicus",
    "CoRoT",
    "Einstein",
    "EUVE",
    "EXOSAT",
    "FAUST",
    "Fermi",
    "FUSE",
    "GALEX",
    "GINGA",
    "GRANAT",
    "HEAO",
    "Hipparcos",
    "HST",
    "HUT",
    "INTEGRAL",
    "IRAS",
    "ISO",
    "IUE",
    "Kepler",
    "MSX",
    "OAO-2",
    "ORFEUS",
    "Planck",
    "ROSAT",
    "RXTE",
    "SAS-1",
    "SAS-2",
    "SMM",
    "SOHO",
    "Spitzer",
    "STEREO",
    "Swift",
    "TD1",
    "UIT",
    "ULYSSES",
    "WISE",
    "WMAP",
    "WUPPE",
    "XMM"
  ]
}