x-ray scattering data for the elements

 Xray::Scattering supports access to X-ray scattering data for atoms and ions.
 It is designed to be a transparent interface to scattering data from a
 variety of sources. Currently, the only sources of data are the Cromer-Mann
 tables from the International Tables of Crystallography and the 1995
 Waasmaier-Kirfel tables. More resources can be added easily.