Bonds, lone pairs, and shells probed by means of on-top dynamical correlations Stefano Pittalis, Daniele Varsano, Alain Delgado and Carlo Andrea Rozzi Eur. Phys. J. B, 91 8 (2018) 187 Published online: 03 August 2018 DOI: 10.1140/epjb/e2018-90143-4