Corresponding internal spectral energy distribution of IC 860 presented in the form of a radiation brightness temperature T_rad. As in Fig. B.1, the brightness in the infrared-to-submillimeter is elevated at φ = 1 (black curve) compared to φ = 0.1 (magenta) throughout the submillimeter-to-infrared region. Frequencies of 5.29 GHz (where T_rad ≈ 8791 K) and 245 GHz (where T_rad ≈ 18 K) are marked. Short horizontal bars indicate the frequencies covered by the ν₁ to ν₃ and the ν₄ to ν₉ vibrational fundamental bands of CH₂NH, where T_rad ≈ 100 K.