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. Author manuscript; available in PMC: 2012 Apr 1.
Published in final edited form as: Semin Radiat Oncol. 2011 Apr;21(2):80–87. doi: 10.1016/j.semradonc.2010.10.003

Figure 1.

Figure 1

Patterned array of xenon atoms on a nickel surface (atomic structure not resolved). Each letter is 50 nm from top to bottom. Reprinted with permission from [2].