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36, 32 ], "origin": [ -17.5, -17.5, -0.5 ], "spacing": 1.0, "range": [ -0.12, 0.0 ], "quantity": "relative P-wave speed", "units": "fraction of background" } ], "finding": "Crosshole rays through the chamber recover it as a slow patch of -11% (air would be -90%): first arrivals bend around a void, so travel-time tomography sees its shadow, not its emptiness. From the surface, with the direct P picked on 16 stacked blows, the same method recovers +0.0%: in uniform rock no first-arrival ray reaches 12 m." }