SEDs for cluster sub-samples. Left: in the redshift−mass plane, we show the distribution of the 561 Planck clusters with known redshift, which are used in this paper. Different colours (black and red) are used for the low- and high-redshift sub-samples, while different symbols (dots and diamonds) are used for the low- and high-mass sub-samples. Middle: in blue circles the 254 clusters at z> 0.25 and in orange triangles the 307 clusters at z ≤ 0.25 (307 clusters), plotted along with the corresponding best-fit models (dashed and dash-dotted lines, respectively). Left: in blue the 241 clusters with M_tot> 5.5 × 10¹⁴M_⊙ and in orange the 320 clusters with M_tot ≤ 5.5 × 10¹⁴M_⊙, along with the best-fit models (dashed and dash-dotted lines, respectively). The rightmost (IRAS) point is not used in the fit.