Rest-frame mean spectral energy distribution of our selection of massive, star-forming galaxies at various redshift measured by stacking analysis. The data points are fitted using the Draine & Li (2007) model. This model is convolved with the redshift distribution of the sources before being compared to the data. The black and blue lines represent the intrinsic and convolved SEDs, respectively. The bottom right corner summarizes the redshift evolution seen in our data.