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The zero index

What happens if we have a lattice plane that does not intercept all three axes?

Taking intercepts gives an *h* index of 1, a *k* index of 2, but
what do we use for the *l* index?

The plane can be said to intercept the *z*-axis at infinity.

In this case we use 0 for the Miller index, giving an index for this plane of:

(120)