Measured UCAMMs spectra. Left: CH stretching mode infrared optical depth. Centre panel: μFTIR (red) and Raman (black) close-up spectra in the nitriles region, normalized to the C=C (IR) and G band (Raman) measured intensities. Right: baseline corrected silicate infrared optical depth, along with different absorption models for several size distributions of olivine (forsterite) and pyroxene (enstatite) magnesium rich end members (see text for details).