To confirm the validity of our regression model, the values of the adjusted coefficient of determination (Adj. R 2 ) for each variable combination and the sorted p-values calculated in the F-statistic test are shown in Figures It is evident that eq. 4 demonstrates the best performance in terms of both Adj. R 2 and p-value. Particularly noteworthy is the p-value, where only eq. 4 satisfies the criterion of pvalue < 0.05, signifying a significance level exceeding 95%, in all regressions. Its regression performance is higher than that of eq. 2, which involves a regression using three variables. This superiority underscores the effectiveness of incorporating 1/𝑟 M 𝑛 as the Coulomb energy term.