Line profile modelings by a sum of a set of Gaussian components for the Hα (left panel) and Hβ (right panel) regions. The blueshifted Balmer absorptions are marked by the short vertical lines. In each panel, the observed and modeled line profiles are plotted by light and heavy solid lines. Each Gaussian component in emission is shown by a dashed line. The subpanel underneath each line spectrum presents the residuals between the observed and modeled profiles.