Kinematics measurements of the OCBF events of June 7, 2011 and December 12, 2013, for the radial heliocentric direction. Panels A and B show the J-map plots for the two events. Dashed lines denote the start and end times of measurements. Green filled symbols show the average positions of the OCBF front, peak, and back. Uncertainties are overplotted on these symbols in red. Panels C and D show time series of corresponding quantities derived from measuring the OCBF front, intensity peak, and back positions with measurement uncertainties. From bottom to top: heliocentric position, instantaneous speed and acceleration, wave thickness, and wave mean intensity. The front, peak, and back positions are plotted with red (solid), green (dashed), and blue (dot-dashed) lines, respectively. The mean speed and acceleration is shown with horizontal lines of respective color.