Top: molecular density measured by SOIR. We consider three main layers above the cloud top (r_cloud ~ 94 km). The slope of a linear fit over three segments provides three scale heights, H₁ = 4.8 km for altitudes below 116 km, H₂ = 3.0 km (116 to 135 km), and H₃ = 4.8 km (135 to 160 km). Bottom: results of the three-layer modeling (best fit). See Table 3 for the model parameters. The purple (upper) curve represents the summation of the fluxes from each of the three layers, here represented in cyan, green, and red. The blue data points are the measurements, as reported in Fig. 6.