Variations in the Hnα line widths with principal quantum number n. The FWHMs presented in the top three panels are calculated with T_e = 10 000 K, and the FWHM in the bottom panel is calculated with T_e = 5000 K. The values of the EMs are the same as in the calculation results shown in the same panel, while the values of the corresponding LOS depth D are different since the values of n_e are different.