Fig. 3.

Orientational correlation function $c(r)$ (Eq. 44) of water dipole moment vectors and the vectors connecting corresponding oxygen atoms and the sodium ion site for simulations in the absence (“unres.”) or presence (“res.”) of an electrostatic potential restraint (Eq. 11) and involving the BM, CM or BA scheme for the treatment of electrostatic interactions (Sect. 3.1)