Two examples of anomalous spectra belonging to the dataset Ls = 180° ± 5° of MY24. One of the spectra (black line) has emissivity values increasing constantly well above 1 in the high wavenumber region, while the other (red line) shows a sudden drop in emissivity at about 1200 cm^-1 and a systematic ripple (inset: see text) between 800 and 1200 cm^-1.