Spectra of two C BCSs after the subtraction of the single stellar population model with the best fit. The first column represents the modeling centered on the Hα line, while the second column shows the fits for the Hβ line. In all panels, the C BCS spectra are depicted in solid lines, the top spectra show the status before the stellar removal and the bottom spectra are the results of the host galaxy stellar population subtraction. The dotted line through the top spectra indicates the best-fit single stellar population model. The dashed line across the bottom spectra indicates the zero flux level.