[
  {
    "eccharts_layer": "composition_ch4_totalcolumn",
    "styles": [
      "sh_nipy_spectral_ch4_totalcolumn",
      "sh_RdGy_r_ch4_totalcolumn"
    ],
    "match": [
      {
        "paramId": "210065",
        "shortName": "tcch4"
      },
      {
        "long_name": "CH4 column-mean molar fraction"
      }
    ]
  }
]