Results of the spectral analysis for the 3.47 μm and 3.53 μm (CH₃OH) absorption bands. Left: derived continua (dashed lines, green) are shown with the observed spectra. Middle: results of the spectral fitting. The dashed lines (blue) represent the laboratory CH₃OH ice spectrum and the dot-dashed lines (red) represent the 3.47 μm absorption band. The solid lines (gray) show the sum of those two components. Right: residual spectra after subtraction of the 3.47 μm band. The spectra are only shown for the sources in which the 3.47 μm band is detected.