Spectra of forbidden lines from F1 (cf. Figs. 5 and 13). All spectra are in the LMC rest frame, and the velocities are for [O III] λ5007 (left), 3727.5 Å (middle), [Fe II] λ5159 (upper right), and [Fe XIV] λ5303 (lower right). For the oxygen lines, the line profiles of the emission from the SNRC in Figs. 16 and 20, multiplied by a factor of 0.01, have been included for comparison (in red). The narrow spectral lines are unresolved, as highlighted for [O III] λ5007 and the [O II] doublet, where the solid black lines show Gaussians with the expected FWHM of the instrument at 5007 Å and 3727.5 Å, i.e., ∼ 355 km s⁻¹ and ∼ 476 km s⁻¹, respectively. Note the broad bases seen for [O III] and possible broad base wings for [O II] λλ3726,3729. Lines of the H I Balmer series are marked in the middle panel. For the iron lines, Gaussians have also been drawn (in blue) according to the expected resolution. Several other lines have also been indicated. Red marks Savitzky-Golay fitting to the spectrum.