A Fortran computer program to collect X-ray diffraction data on macromolecules

A Fortran minicomputer program for the collection of X-ray diffraction data from protein crystals is described. Data collection efficiency has been achieved by means of: ω step scans for reflection intensity, radial step scan along 2θ to estimate background intensity and preselected reflection files. The program includes a standard reflection monitor, a means for slight misalignment compensation, empirical absorption correction data, Bijvoet pair collection, and the ability to collect data for the crystal lifetime without operator intervention.