Program for crystal setting and data reduction on a PW 1100 diffractometer using a simple method based on real space

A simple method, based on real space, is described to calculate on a PW 1100 diffractometer D and RD vectors for anisotropic extinction corrections. and for every 0 (0 = rotation around the reciprocal vector). This problem has already been solved for other diffractometers in reciprocal space (Coppens, Leiserowitz & Rabinovich, 1965; Coppens, 1970) and has been re-examined for the PW 1100, using a simple procedure in real space.