Figure 4.

ROC curves for Ca, Mg, Zn, and Cl ions containing proteins data set, calculated with respect to different parameters. The first number corresponds to the dielectric constant of the solution, and the second one corresponds to the ionic strength in moles/l. The x axis represents the Rank of the closest representative grid point to the experimentally determined ion position. The y axis is the number of successful predictions (true predictions) in percentage of all predictions. A prediction is considered to be true if the representative point situated at the shortest distance from the ion experimental position (Dmin) is predicted.