Representation of data analysis for the forsterite Mg₂SiO₄. From top to bottom: (a) self-absorption correction: the synchrotron raw data (red solid line) and the signal corrected with the FLUO tool (blue dashed line).(b) Transmission for a thin layer (τ = 0.5 μm): the measured edge with XAFS (in black) are normalised using the tabulates values from Henke et al. (1993). (c) Optical constants: k is represented with the solid line while n − 1 with the dashed line (in units of 10⁻⁴). (d) The extinction (black solid), absorption (red solid), and scattering (blue dashed) cross sections per hydrogen nucleus for the Mathis, Rumpl, & Nordsieck (1977) dust model.