Continuum-subtracted spectrum (blue) overlaid with the best-fit SO₂ model (orange). The orange bars in the bottom indicate the wavelength ranges that were included in the fit, and the black bars show the wavelength ranges over which σ is calculated. The P-branch lines around 7.4 µm appear to be overfitted since the 7.4 µm ice absorption could not be disentangled from the gas-phase emission.