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1 A crystal consists of a three- dimensional stacking of a unit cell defined by a space lattice. In crystallography, the three edges of the lattice are labelled a, b, and c (or x, y, and z), and they define both the edges of crystals in the seven crystal systems and their crystallographic axes.

2 In remote sensing, a boundary between area of different tones. See also edge enhancement.

Subjects: Earth Sciences and Geography.

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