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==The crystal structures of metals==
[[Image:Empty-Lattice-Approximation-
[[Image:Empty-Lattice-Approximation-BCC-bands.svg|thumb|left|300px|Free electron bands in a BCC crystal structure]]▼
[[Image:Empty-Lattice-Approximation-HCP-bands.svg|thumb|500px|Free electron bands in a HCP crystal structure]]
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</gallery>
▲[[Image:Empty-Lattice-Approximation-
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