Electron cooling time in the galaxy frame as a function of γ. Top panel: blazar emission site located in the BLR. Bottom panel: blazar located in the MT. Broken lines represent the various cooling mechanisms and the solid black line is the total cooling time. Plots were calculated for seed photon energies _{0, BLR} = 3 × 10 ⁻⁵ and _{0, MT} = 5 × 10 ⁻⁷, seed photon energy densities U _BLR = 10 ⁻² erg cm ⁻³, U _MT = 10 ⁻⁴ erg cm ⁻³, and magnetic field energy U _B = 100  U _EC.