Brightness temperature spectra for the 1500 K case. The solid line indicates the drift phoenix atmosphere without the particles included. For the dotted line the scattering drift-phoenix particles are included. The dashed line shows the spectrum for purely absorbing particle, but same optical thickness (single-scattering albedo, or ssa in the legend, of zero). The dot-dashed line corresponds to the same particles, but now assumed perfectly scattering (single-scattering albedo of unity).