{
  "coordinates": "authored 960x640 input pixels; not output tracking",
  "landmarks": [
    {
      "name": "cam-hub",
      "x": 400,
      "y": 400
    },
    {
      "name": "roller-center",
      "x": 400,
      "y": 230
    },
    {
      "name": "first-contact",
      "x": 400,
      "y": 260
    },
    {
      "name": "high-arc",
      "x": 600,
      "y": 400
    }
  ]
}