{
  "version": "1.0",
  "coordinate system":{"model":"cartesian"},
  "features":
  [
    {
       "model":"oceanic plate", "name":"Overriding Plate", "max depth":100e3, 
       "coordinates":[[0,0],[0,1000e3],[1500e3,1000e3],[1600e3,350e3],[1500e3,0]],
       "temperature models":
         [
           {"model":"half space model", "max depth":100e3, "spreading velocity":0.04, 
            "ridge coordinates":[[[400e3,-1],[-100e3,2000e3]]]}
         ],
       "composition models":
         [
           {"model":"uniform", "compositions":[0], "max depth":50e3}
         ]
    },
    {
      "model":"oceanic plate", "name":"Subducting Oceanic plate", "max depth":100e3, 
      "coordinates":[[2000e3,0],[2000e3,1000e3],[1500e3,1000e3],[1600e3,350e3],[1500e3,0]],
      "temperature models":[{"model":"linear", "max depth":100e3}],
       "composition models":[{"model":"uniform", "compositions":[3], "max depth":50e3},
                             {"model":"uniform", "compositions":[1], "min depth":50e3}]
    }
  ]
}