Comparison between the fiducial PRODIMO HD 100546 disk model (Woitke et al. 2019) and multi-parameter variants of the model. We include the observational VISIR data corrected for sky transmission and additional observational data (Malfait et al. 1998; van Boekel et al. 2004; Ishihara et al. 2010). The grey filled area illustrates the J8.9 filter response curve (arbitrary vertical scaling). Residuals between the various disk models and the ISO-SWS spectrum are shown in the lower panel as the ratio between the model SED and the observed spectrum.