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XD - a multipole refinement and analysis of charge densities

In 1993 the IUCr Commission on Charge, Spin and Momentum Densities adopted as a project the writing of an integrated package, to be distributed, supported, documented and maintained centrally, with the objective of promoting a wide application of X-ray charge density methods to chemical problems. The outcome is the package now known as XD. Further information is available at

Paul Mallinson, U. of Glasgow