Light curves of 0716+714 for the Faraday rotation measure RM (rad m^-2) (top), the a index (middle) and the depolarization index β (bottom). In the top panel, the black symbols indicate the rotation measure between 22 and 43 GHz and the blue symbols indicate a rotation measure between 43 and 86 GHz. Measurements are shown only when the measurements at 86 GHz are available to estimate the indices a and β. In the bottom panel, β between 43 and 86 GHz is plotted at the time of 86 GHz observed by the Ulsan telescope .