(a) Comparison of FWHM values of broad components of Hβ and Hα lines. The dashed line denotes a line where the FWHM values of the Balmer lines are identical, and dash-dotted line is a well-known relationship between the FWHM values of the Balmer lines (Bisogni et al. 2017). (b) Comparison of Balmer line FWHM values measured from this work and Urrutia et al. (2012). Red circles denote the comparison of FWHM_Hβ measurements, and blue squares mean the comparison of FWHM_Hα measurements. Green triangles represent the FWHM_Hα measurement comparison, but the FWHM_Hβ measured in Urrutia et al. (2012) was converted to FWHM_Hα using the relationship established in Bisogni et al. (2017). The meaning of the dashed line is identical to that of panel (a).