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ERKALE \cite{Lehtola_2012} is designed to compute X-ray properties, such as ground-state electron momentum densities and Compton profiles, and core (x-ray absorption and x-ray Raman scattering) and valence electron excitation spectra of atoms and molecules.   \paragraph{Helper Applications}  FragIt \cite{Steinmann_2012} generates fragments of large molecules to use as input files in quantum chemistry programs that support fragment based methods.  \paragraph{Visualization}