Number of galaxy clusters per logarithmic bin of (see Eq. (7)), for the CR component (solid black), DM annihilation (dotted red), and DM decay (dashed blue). The four panels correspond to four integration angles α_int (from top left to bottom right, 0.01°, 0.05°, 0.1°, and 0.5°). The index s of the power law fit is shown for α_int = 0.1° for the three components.