allows faster convergence of the integrals with respect to the supercell volume. For isolated systems, the symmetry of the "fictitious" supercell and its volume Ω are therefore the adjustable parameters to converge the exchange-like integrals, with the aim of removing the electrostatic interactions between periodic images when the box size increases. In that case, it has been shown that the correction χ of the singularity in the Coulomb potential greatly improves the convergence of the total energy as well as the HOMO-LUMO gap with respect to the supercell size, as opposed to simply neglecting the G = 0 component. Hence, we will focus on the behavior of this correction when applied to the MP2 correlation energy.