Treatment of enhanced zones and rows in normalizing intensities

Contrary to the recommendation in some textbooks, enhanced reflexions should not be divided by the enhancement factor in forming general averages for normalization. The intensity required for the enhancement is drawn from the adjacent reflexions in the reciprocal lattice, and the correct average intensity is obtained by including all reflexions at their observed intensity. Weights based on the number of reflexions of different types intercepted by the spherical shell that defines those included in the average may be appropriate.