{
  "area": "800x600",
  "slots": [
    {
      "name": "西门子星",
      "file": "bw_star.png"
    },
    {
      "name": "频率条纹",
      "file": "bw_sweep.png"
    },
    {
      "name": "渐变棋盘",
      "file": "bw_checker_sweep.png"
    }
  ]
}