Internal spectral energy distribution of IC 860 with an effective solid angle Ω = 3 × 10⁻¹² sr and a total power L = 6 × 10¹¹ L_⊙. The upper curve (black in the submillimeter and infrared log ν = 11.5 to 13.8) shows the brightness for φ = 1, while the lower curve (magenta in the submillimeter and infrared) is the corresponding brightness for φ = 0.1. The orange line indicates the underlying nonthermal power-law source, which dominates at radio frequencies.