Best-fit SEDs of the X-ray knots in M 87. All data points are taken from the references, see details in Section 2. The dotted lines and dashed lines represent the radiation produced by the low-energy and high-energy electron populations, respectively. The cyan and yellow lines denote synchrotron and IC-CMB radiation, respectively. The dashed blue lines represent the IC contribution from the second electron population scattering off the synchrotron photon field of the first electron population. The solid black lines indicate the total nonthermal emission. In the γ-ray band, measurements from different instruments are denoted by different colors. In the last panel, the solid lines of different colors represent the total IC emission contributions from the different knots, and the black line represents the sum of the emission from all modeled knots.