Reconstruction of the Hβ and Hα line profiles using the Ca IIλ8662 line profile, appropriately shifted by a velocity difference Δv and broadened with a Lorentzian function of half width Γ. The resulting smoothed profiles are shown by a dashed red line (top panels). The residual fluxes are shown in the lower panels. The residual flux of the Hβ profile from Spectrum 1 (2015 September 24) reveals a small residuum from narrow Hβ emission (lower left panel). The residual flux of the reconstructed Hβ rms profile reveals underlying He Iλ4922 emission and possible emission from an unidentified line species at 4812 Å (lower middle panel). While the central rms profile of Hα rms is well approximated by a shifted and broadened Ca IIλ8662 difference profile, we see indications for an additional underlying and extremely broad component in the residual flux (lower right panel).