Top panels: comparison between the raw observed data (within the errors; shaded gray area) and the results derived when using the five models. The color code is as in previous figures (Unsubtracted model is in orange, FIT3d is in green, STARLIGHT/MILES in dark blue, STARLIGHT/STELIB in magenta and pPXF is in red). The vertical dotted lines identify the rest–frame wavelength of the Hα-[NII] complex. Bottom panels: Chi ( χ) distribution obtained for each method in the rest frame wavelength range 6540–6600 Å (see text in Appendix B). The vertical dot lines identify the rest–frame wavelength of the Hα-[NII] complex. The horizontal area highlighted by the dashed gray lines represents the ±1 χ range values.