Fig. A.1.
(General comments about the panels as in Fig. 2) Line-fitting results for the spectrum “a” obtained following the assumptions of case 2 [λ free, σ fixed] (top), case 3 [λ fixed, σ free] (middle), and case 4 [λ and σ free] (bottom). For each case and method the centroid of the Hα and [NII] lines is highlighted using the dashed lines. The line-fitting results are shown using the colored solid line: the “unsubtracted” data are in orange, FIT3D data in green, STARLIGHT (MILES) data in dark blue, STARLIGHT (STELIB) data in magenta and pPXF data in red.
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