Relationship between dust spectra peak equivalent width and stellar mass (left panel), dust luminosity (central panel), and Dale et al. (2014)α parameter (right panel). Filled red squares represent ULIRGs, and filled blue triangles correspond to LIRGs. The most extreme value of EW_dust was found for the most distant object in the ADF–S sample (z = 1.23): a quasar HE 0435-5304. The dashed line represents the linear fit to the data. In the α–EW_dust relation (right panel) 2σ uncertainties for the fitted line (Eq. (7)) were added (solid gray lines).