annotations/annotation_00019.json

[
  {
    "label": "frontier",
    "start": [
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    ],
    "end": [
      1158.0,
      722.0
    ]
  },
  {
    "label": "frontier",
    "start": [
      360.0,
      874.0
    ],
    "end": [
      424.0,
      902.0
    ]
  }
]