Figure 4.7: (a) Calculated free energy for the hydrogen adsorption (GH
along with the uncertainties and the probabilities (P(|G| 0.5)) that the
compounds have for the free energy to lie in the range (-0.5, 0.5) eV in the 2H
structure. Red error bar indicate instability of the compound with respect to
the standard state. (b) Similar plot as (a) for the 1T structure.