3 Take the reciprocals of the intercepts 1/x, 1/y, 1/z 4 Clear fractions but do not reduce to lowest integers 5 Enclose them in parentheses,(h k1) 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 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