Figure 2.

Electron density difference contour between the polarized and unpolarized systems, $\mathrm{\Delta }\rho =\rho (\widehat{A}{\psi }_a{\psi }_b{\psi }_c)-{\rho }^o({\psi }_a^o{\psi }_b^o{\psi }_c^o)$, for (a) the minimum-energy structure (c-W3) and (b) the symmetric configurations (s-W3). The structure orientations are identical to that shown in Figure 1 and the contour levels are at 0.003 au with red contours representing gain in electron density and blue for charge depletion.