(sub)mm spectrum of the quasar APM08279+5255. The black circle is the value obtained here in the third NIKA run, whereas other data are taken from Beelen et al. (2006), Garcia-Burillo et al. (2006), Wagg et al. (2006), Krips et al. (2007) and Riechers et al. (2009). The spectral energy distribution model by Beelen et al. (2006) is shown as the black line. It includes a dust component (dashed line) and a synchrotron component (dotted line).