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==Second, third and higher Brillouin zones==
[[Image:Brillouin_Zone_(1st,_FCC).svg|thumb|300px|right|FCC Brillouin zone]]
"Free electrons" that move through the lattice of a solid with wave vectors <math>\bold{k}</math> far outside the first Brillouin zone are still reflected back into the first Brillouin zone. See the [[#External links|external links]] section for sites with examples and figures.
 
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==The crystal structures of metals==