Close-up of the disk radiative transfer models (upper panels) corresponding to silicates core, M15 ice mantle composition and size distribution MRN, a_max = 0.25 µm (model #4); τ₁, a_max = 1 µm (model #5); τ₃, a_max = 3 µm (model #6); as observed under 71 and 71.5 degrees of inclination, in the water ice and carbon dioxide stretching modes range. A spline continuum passing through the indicated circle points, well apart from the core of the ice bands, is overlaid (dashed line). Lower panels show the extracted resulting transmittance spectra after dividing by this estimated continuum. In the highest optical depth spectrum (i = 71.5°, τ₃) both the calculated spectrum and a slightly numerical noise filtered spectrum are shown. The asymmetry of the water ice band as well as the shift in the band centre are evidenced and accompanies the observed higher contrast CO₂ profile deformation.