Compilation of all thermal emission observations of the dust in W Hya. The red and blue solid lines are the ISO SWS spectra from 1996 and 1997, respectively, the green solid line is the averaged ISO LWS spectrum, the purple and light blue solid lines are the PACS and SPIRE spectra, and the black squares and black circles depict the PACS and SCUBA photometric measurements. A black-body spectrum of 2500 K and 5400 L_⊙ is overplotted to guide the eye (black dashed line).