SEDs of the Galactic post-AGB stars HD 56126 (upper panel) and 89 Her (lower panel). The former is a carbon-rich post-AGB star and the latter an optically bright post-AGB star surrounded by a compact disc. The diamonds represent the dereddened broadband photometry, the full line at lower wavelengths the appropriate photospheric model, and the full line in the IR is the ISO spectrum.