Fitting of the continuum of APM 08279+5255 and NCv1.143. Fluxes and errors are in black and blue, respectively. The solid red lines represent the total flux from the model. The dotted and dashed orange lines are the free-free and thermal dust components from the model, respectively. It is clear from the fitting that APM 08279+5255 has a flatter spectrum, which can be explained by contributions from free-free and/or corona emission from the SMBH, while the continuum of NCv1.143 is dominated by thermal dust.