From left to right: Unsubtracted MUSE spectra at the different positions (identified by the letters; see Fig. 1) along with the pure gas spectra obtained from applying the three different stellar-subtraction methods, respectively: FIT3D, STARLIGHT (MILES and STELIB) and pPXF methods. The Hαλ6563 and the two forbidden [NII]λλ6548, 6583 lines are shown. The line-fitting results are shown using the colored solid line: the unsubtracted data are in orange, FIT3D data are in green, STARLIGHT (MILES) data are in dark blue, STARLIGHT (STELIB) data are in magenta, and pPXF data are in red. The line fitting case[1] (all parameters fixed) is considered. The flux is in units of 10⁻²⁰ erg s⁻¹ cm⁻² Å⁻¹ and the wavelength is in Å.