Subtracting the local continuum around the SO₂ v₃ band. Top: spectrum of IRAS 2A around 7.35 µm showing the gas-phase SO₂ emission superimposed at various ice absorption bands. The red line shows the estimated local continuum based on a fourth-order polynomial fit through the red dots. Middle: spectrum of IRAS 2A with the local continuum subtracted. The 7.25 µm complex organics ice absorption feature is clearly present. A simple Gaussian fit to this ice absorption feature based on fitting the spectrum in the shaded region is shown in green. Bottom: final continuum- and ice-feature-subtracted spectrum.