Fig. 4. Networking value.

The upper panel shows the ELF isosurface and the three dimensional network spanning through all the crystal, which is formed by the ELF saddle points and the atoms, associated with the ϕ value for PdH(70), YH₄(15), and H₃S(138). The networking value is given for each case. The bottom panels show the critical temperature T_c as a function of the networking value ϕ (left), the networking value multiplied by H_f (center), Φ = ϕH_f, and the networking value multiplied by H_f and the cubic root of the fraction of the DOS at the Fermi energy coming from the hydrogen atoms H_DOS, ${\mathrm{\Phi }}_{\mathrm{DOS}}=\varphi H_f\sqrt[3]{H_{\mathrm{DOS}}}$ (right). The dotted line in the last panel represents a fit for which T_c = (750Φ_DOS − 85) K which is able to estimate T_c within 60 K.