Dust SED of G09v1.97. The fluxes are taken from Herschel and NOEMA measurements (Yang et al. 2016), and also from this work for the 0.89 and 1.94 mm continuum fluxes (blue points). The fit also takes into account the dust continuum fluxes of the compact (the interacting region) and extended (the merging galaxies) dust component from our lens model, indicated by the open and filled circle (green and light-blue for different temperature components), respectively. The SED fit has also taken the differential magnification for the compact and extended components into account. The solid blue line shows the best fit, while other dashed/dotted lines are decompositions of different temperature components. See text for details.