{
  "matrix_D_L_R": [
    [
      1,
      -1,
      0
    ],
    [
      1,
      0,
      0
    ],
    [
      1,
      0,
      1
    ],
    [
      0,
      1,
      0
    ],
    [
      0,
      1,
      1
    ],
    [
      0,
      0,
      1
    ]
  ],
  "spans": [
    2100,
    2700,
    7000,
    600,
    4900,
    4300
  ],
  "rank": 3,
  "interpretation": "Six displayed intervals depend on three interval parameters plus a separately appointed target; source rows and the SP incidence remain provenance, not erased inputs."
}