Fig. 3
Top panel: STARLIGHT stellar-population spectrum best fit to the continuum of the spectrum obtained at the center of the host galaxy of SN 2006aa. The difference between the observed spectrum and the best fit gives the pure emission-line spectrum. Bottom panel: the triple-Gaussian fit on the continuum-subtracted Hα and [N ii] lines of the bright H ii region at the center of the host galaxy of SN 2006aa. The observed fluxes are represented with black crosses, the best fit in red, the Hα component in blue, and the [N ii] components in green.
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