Same as Fig. 2, except that the red circles are the massive 24 μm sources (11 < log (M⋆) < 11.5) and the size of the sources is proportional to the 24 μm flux. The contours refer to the full galaxy sample at log (M⋆) > 9.5. The largest fraction of massive galaxies are well below the selection criterion and the brightest ones are located in top right part of the diagram with the most extinguished sources.