Fig. 11.

a Pictorial representation of the original idea of AdResS;  b Abrupt version of AdResS as in Ref. [29] i.e. in the $\Delta$ region a switching function is no more required. Atomistic molecules interact with coarse-grained molecules (and vice versa) via a coarse-grained potential acting on the center of mass of each molecule.  c The CG region becomes a TR region, that is a region of non-interacting point-particles (tracers), the thermodynamic force is calculated over the whole $\Delta \cup \mathrm{TR}$ region and a capping force avoids clashes of atoms upon acquisition of atomistic degrees of freedom by tracers entering in the $\Delta$ region at unphysical distances from each other. Figure reproduced from Ref. [30]