Evolution of the break frequencies, ν_c (top), ν_m (middle) and ν_sa (bottom), for the afterglows of our four GRBs. The solid lines corresponds to the expected evolution of each frequency from the standard afterglow theory. The shaded regions are the fits for each break frequency. The horizontal dashed lines mark the mid-frequency for the four main observing ranges, i.e., X-rays, optical, sub-millimetre and radio.