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 },
 "finding": "Run whole, the chain cannot tell the chamber is there. Over simulated desert shaking at Giza's measured level, the chamber changes the satellite's image by 1e-10 of itself (its imprint is 2e-09 rad of phase) and the published method's depth image by 1e-08: with and without the chamber the pictures are the same. Its imprint must be multiplied by 1e+10 before the method's output changes visibly over it, and even then the change is spread evenly over every depth it draws (0.68 to 1.25 times its average): the picture's texture is reshuffled, and nothing marks the chamber's depth. With the published settings the whole depth axis ends at 13.4 m, above the chamber; another 'sound wavelength' only relabels the same picture. Over the chamber a seismometer records the ground moving at 0.040 um/s; the dwell's velocity series wanders by 398 um/s, 9984 times more, and not with it."
}