[
  {
    "eccharts_layer": "composition_ch4_surface",
    "prefered_units" : "ppbv",
    "styles": [
      "sh_nipy_spectral_ch4_surface",
      "sh_RdGy_r_ch4_surface"
    ],
    "match": [    
      {
        "levtype": "ml",
        "levelist" : ["137"],   
        "paramId": ["210062","217004"],
        "shortName": ["ch4","ch4_c"]
      }
    ]
  }
]
