{
  "fixture": "V18-overlap-report-guide-r1",
  "sum_seconds": 8100,
  "union_seconds": 5400,
  "overlap_seconds": 1800,
  "overcount_seconds": 2700,
  "sum_minutes": 135,
  "union_minutes": 90,
  "overlap_minutes": 30,
  "overcount_minutes": 45,
  "definitions": {"sum": "sum of every segment", "union": "elapsed time covered by at least one segment", "overlap": "time covered by at least two segments", "overcount": "sum minus union"}
}