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NXMEM electron-density maps for Sn (left) and Te (right) in the (001) plane from 20 to 400 K for sample A. Contour lines have been set at 64, 128, 256, 512, 1024, 2048, 4096 and 8192 e Å−3. An additional contour line has been added as a guide to locate the maximum corresponding to the nuclear position.
