The first test consists in a small crystal $4\times4\times4$ of NaCl. It is composed of 128 atoms The second test is a larger crystal $10\times10\times10$ of NaCl and have 2000 atoms. The positions and the forces are stored in the \texttt{REVCON} file and the energy in the \texttt{STATIS} file. The Ewald's parameters are chosen such that the Ewald sum precision is $10^{-14}$. In the test1 (reps. test2) the cut off is $8\,\AA$ (reps. $12\,\AA$) and the reciprocal lattice vector in $18$ (resp. 25) in each direction.