The comparison of the calculated amplification coefficients β_n,n+1 using the Case B model, the EPA model, and the current model with full radiative transfer is plotted in the top panel. The electron temperature and density of the H II region are 6000 K and 10⁷ cm^–3. The value of EM is 10¹¹ cm^–6 pc. The differences between β_n,n+1 in the center and the boundary of H II regions in two cases of identical n_e but different T_e and EM are plotted in the middle panel. In the bottom panel, the differences between the luminosities of Hnα lines calculated using the Case B model, the EPA model and the current model for the case of T_e = 6000 K, n_e = 10⁷ cm^–3, and EM= 10¹¹ cm^–6 pc are presented.