Using De Wolff's (1957) equations two centrosymmetrical reciprocal lattice planes are found which intersect along a common axis. Assuming the Q-value of a particular lattice point to be R, planes parallel to the centrosymmetrical planes are constructed. The value of R is found by considering the differences in the Q-values of a particular row of the parallel planes. The nature of distribution of equal Q-values on the parallel planes exhibit the symmetry of the crystal.

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