SAPI: a direct-methods program for finding heavy-atom sites with SAD or SIR data

SAPI is a CCP4-format program that applies a direct-methods procedure to find heavy-atom sites using single-wavelength anomalous dispersion (SAD) or single-isomorphous replacement (SIR) data. The program is designed to run in a fast (typical CPU time consumed is less than 1 min) and simple way. User input is kept to a minimum and the default parameter values are adequate in most cases. It can also be used to solve general small-molecule structures.