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**Up:** 4. Crystallographic Calculations Using the Reciprocal
** Previous:** 4.3 Indices of the set of

Let *h*_{1}, *k*_{1}, *l*_{1} and *h*_{2}, *k*_{2}, *l*_{2} be the Miller indices of the two sets of
direct lattice planes. The vector product of the two reciprocal lattice vectors
associated with them is necessarily parallel to their zone axis. The
coordinates of this zone axis are therefore given by:

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(4.3) |

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