Radio afterglow light curves. Solid lines indicate the model light curves at 97.5 (green), 230 (blue), and 345 GHz (magenta) based on the standard forward shock model. Dark gray dotted lines show the simple power-law fittings for 230 GHz data before and 4 days after the burst. Light gray dotted lines show the simple power-law functions for 97.5 GHz with α = −0.9 and 345 GHz with α = −1.2. Thin black dashed lines indicate the epochs of ALMA polarimetry.