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the obvious advantage of using exact solutions of the many-body  problem as reference data, this is often not possible and one usually  needs to resort to the more commonly used experimental or  highly-accurate quantum chemistry quantum-chemistry  data. In this case, the flexibility of the real-space method, allowing for the calculation of many  different properties of a wide variety of systems, is again an  advantage. Octopus has therefore been used, among others, used  to benchmark the performance of xc functionals whose potential has a correct  asymptotic behavior~\cite{Oliveira_2010} when calculating ionization  potentials and static polarizabilities of atoms, molecules, and