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SIR 97 is the integration of two programs,SIR 92 andCAOS , the first devoted to the solution of crystal structures by direct methods, the second to refinementvia least-squares–Fourier procedures. Several new features have been introduced inSIR 97 with respect to the previous version,SIR 92: greater automatization, increased efficiency of the direct methods section, and a powerful graphics interface. The program also provides publication tables and CIF files.