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{
  "release_name": "chartbench-e-benchmark-432-20260425",
  "sample_count": 432,
  "chart_types": {
    "area": 24,
    "bar_h": 24,
    "bar_v": 24,
    "boxplot": 24,
    "bubble": 24,
    "combo_dual_axis": 24,
    "dashboard": 24,
    "heatmap": 24,
    "histogram": 24,
    "infographic_like": 24,
    "line": 24,
    "multi_panel": 24,
    "pie_donut": 24,
    "radar": 24,
    "scatter": 24,
    "stacked": 24,
    "table_chart_composite": 24,
    "waterfall": 24
  },
  "difficulty_tiers": {
    "L1": 144,
    "L2": 144,
    "L3": 144
  },
  "splits": {
    "train": 289,
    "val": 50,
    "test": 93
  },
  "source_roots": {
    "broad_standard_pool": 162,
    "broad_advanced_pool": 126,
    "broad_extreme_pool": 144
  }
}