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A set of Fortran programs has been written for the on-line measurement of Weissenberg films with a rotating-drum microdensitometer, interfaced to a small computer. The minimum memory capacity required is 8K 16-bit words, but the evaluation speed can be increased from about 10 to about 30 reflexions/min if a 12K or 16K memory is used. The crystal structures determined from data obtained with the system have refined to R = (Σ|Fo − |Fc || /ΣFo) values of 0.06–0.07.

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