Variation between 250 and 700 km of the haze extinction coefficients at 3.33 μm (solid line with upward triangles for the aromatic component) and 3.38 μm (solid line with downward triangles for the aliphatic component). The extinction coefficient profiles inferred by West et al. (2011) from ISS/UV imaging (dashed line) and by Koskinen et al. (2011) from UVIS stellar occultation measurements (dotted line) are also represented. The local maxima around 500 km correspond to the detached haze layer.