Maps of χ² for fits of the haze continuum in windows as a function of the imaginary refractive index κ and of the number of grains per aggregate N for the four observations. The values of χ² are adjusted for the minimum value of χ² to be equal to the number of data minus the number of free parameters. This was necessary to be able to draw the 1σ error envelope, while there are differences in aerosol structure between different observations, as we later show. For clarity, we only show the contours of the 1σ error bars for fractal dimensions D_f = 2, 2.1, 2.2, 2.3, 2.4, and 2.5.