{
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  "title": "The chamber's echo, imaged from the surface",
  "date": "2026-09-27",
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    0.021,
    0.019,
    0.035,
    0.03,
    0.013,
    0.01,
    0.023,
    0.007,
    0.034,
    0.065,
    0.066,
    0.038,
    0.005,
    0.024,
    0.053,
    0.079,
    0.078,
    0.038,
    0.017,
    0.04,
    0.018,
    0.029,
    0.062,
    0.055,
    0.042
   ],
   [
    0.051,
    0.0,
    0.035,
    0.046,
    0.029,
    0.002,
    0.008,
    0.006,
    0.001,
    0.018,
    0.035,
    0.026,
    0.015,
    0.059,
    0.074,
    0.054,
    0.02,
    0.007,
    0.03,
    0.052,
    0.054,
    0.024,
    0.025,
    0.05,
    0.038,
    0.0,
    0.03,
    0.034,
    0.015
   ],
   [
    0.047,
    0.036,
    0.025,
    0.014,
    0.005,
    0.006,
    0.018,
    0.018,
    0.011,
    0.017,
    0.039,
    0.049,
    0.025,
    0.025,
    0.067,
    0.077,
    0.062,
    0.044,
    0.035,
    0.025,
    0.02,
    0.034,
    0.065,
    0.092,
    0.099,
    0.087,
    0.059,
    0.021,
    0.011
   ]
  ],
  "plane_y": -0.25,
  "plane_z": -14.75
 },
 "volume": {
  "shape": [
   57,
   57,
   59
  ],
  "origin": [
   -13.75,
   -13.75,
   -1.25
  ],
  "spacing": 0.5,
  "quantity": "migrated echo amplitude",
  "units": "normalised"
 },
 "movie": {
  "shot": [
   0.25,
   0.25,
   -0.25
  ],
  "frames": 89,
  "grid_origin": [
   -27.75,
   -27.75,
   1.75
  ],
  "spacing": 0.5,
  "shape": [
   112,
   112
  ],
  "dt_ms": 0.381818
 },
 "finding": "The chamber's echo is 21 dB below the records and -6 dB against their noise; migrated back through the known rock it lights up the chamber at 6.0× the image elsewhere, brightest 2.8 m from its centre."
}