Comparison of the temperature stratifications resulting from the inversion of Stokes profiles, where the Stokes I profile was reduced by a flat continuum of (red), (orange), (green), and (olive). The blue Stokes I profile corresponds to the post-WLF phase at the same location and the temperature stratification indicated by the blue line corresponds to this profile. Left panel: lines correspond to the observed profiles, and the * symbols to the best fits obtained by the inversion code SIR.