{
  "paper_bgcolor": "lightgray",
  "width": 600,
  "height": 400,
  "margin": {
    "t": 0,
    "b": 0,
    "l": 0,
    "r": 0
  },
  "grid": {
    "rows": 2,
    "columns": 2,
    "pattern": "independent"
  }
}