Fig. 2: Comparing the prediction of the model proposed by Cama et al. (14) to surface protonation data. (a) Best-fit curve of Eq. [4] to surface titration curve. The thick solid line is a curve fit to the data of Huertas et al. (11). The dotted and dashed lines are plots of the second and the third terms of the fitting to the data of Huertas et al. (11); (b) best-fit curves of the first two terms (G0+G1) in Eq. [4] to the original surface titrations of Brady et al. (4) and Ward and Brady (8); (c) best-fit curves of the first two terms (G0+G1) in Eq. [4] to the recalculated surface titrations of Brady et al. (4) and Ward and Brady (8). Source data is as in Fig. 1