Take the reciprocals of the intercepts 1/x, 1/y,
1/z.
Clear fractions but do not reduce to lowest
integers.
Enclose them in parentheses, (h k l)
Example: 1/2,1,2/3 2,1,3/2 (423)
Plane indices referred to three axes a, b and
c are also called Miller Indices.
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