Radio/optical/X-ray SEDs. Filled (empty) red star: radio data (upper limit). Black dots: optical and X-ray data. Upper panel: GRB 071003. Light blue solid line: optical/X-ray SED. Blue dashed line: power-law that fits the data. Black solid line: radio/optical/X-ray SED fit function. Black dashed line: the absorption frequency (ν_a), the synchrotron frequency (ν_m), and the cooling frequency (ν_c). Gray lines: radio/optical/X-ray SED tests with relative absorption frequencies (blue dashed lines), synchrotron frequencies (orange dashed lines), and cooling frequencies (green dashed lines). Lower panel: GRB 090313. Red solid line: the optical/X-ray SED fit function. Orange dashed line: broken power-law that fits the data. Blue dotted line: radio/optical/X-ray SED calculated considering ν_BR = ν_c. Red dotted line: radio/optical/X-ray SED calculated using the same characteristic frequencies as the red dotted line, but considering the normalization for the radio data. Gray dashed line: the absorption frequency (ν_a), the synchrotron frequency (ν_m), and the cooling frequency (ν_c).