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Figure 1
Left: The standard Lena image as a non-periodic object of a square support, surrounded by a region of zero density. Middle: A much simpler object where zero density is also present inside the confining square. Right: The same molecular object without the surrounding region of known zero density. This corresponds to the unit cell of a periodic crystal.

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ISSN: 2053-2733
Volume 64| Part 1| January 2008| Pages 123-134
https://doi.org/10.1107/S0108767307046028
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