text: Models of electrolyte solutions from molecular descriptions: The example of NaCl 
  solutions 
  
  John Jairo Molina1,2,3,∗ Jean-Fran¸cois Dufrˆeche1,2,3,† Mathieu 
  Salanne1,2, Olivier Bernard1,2, Marie Jardat1,2, and Pierre Turq1,2 
  1 UPMC-Universit´e Paris 06, UMR 7195, PECSA, F-75005 Paris, France 
  2 CNRS, UMR 7195, PECSA, F-75005 Paris, France 
  3 Institut de Chimie S´eparative de Marcoule (ICSM), 
  UMR 5257 CEA–CNRS–Universit´e Montpellier 2, Site de Marcoule, 
  Bˆatiment 426, BP 17171, 30207 Bagnols-sur-C`eze Cedex, France 
  
  We present a method to derive implicit solvent models of electrolyte solutions from all-atom 
  descriptions; providing analytical expressions of the thermodynamic and structural properties of 
  the ions consistent with the underlying explicit solvent representation. Eﬀective potentials between 
  ions in solution are calculated to perform perturbation theory calculations, in order to derive the 
  best possible description in terms of charged hard spheres. Applying this method to NaCl solutions 
  yields excellent agreement with the all-atom model, provided ion association is taken into account. 