Spitzer color-color diagram. SAURON Sa sample nuclei are plotted in red and nearby Messier AGN in black. For M 87, the colors of the large-scale jet at knots A/B denoted as M87 jet, the stellar emission at the same radius as the jet (M87 gal), and the stellar-subtracted jet emission (M87jet, ns) are also indicated. Black bodies at various temperatures are plotted with a black line. Power-law models νF_ν ∝ ν^α at various spectral indices 0 ≤ α ≤ 3 are plotted with a green line.