Phased kinetic and radiative flux measurements with trend curve. Measurements points are the most probable values of |V_shock| and F_r (φ)∕F_r(1.04). Associated uncertainties are computed in Tables 8 and 6. Red dots are measured values from August 13, 2014 while the red triangle represents the night of October 12, 2013. Velocities from April 2017 are black squares with the corresponding trend curve (grey dotted line). Panel a: evolution of |V_shock| plotted with a cubic spline interpolation curve. In the phase interval φ = 0.90−0.92, V_shock decreases much more than in the phase interval φ = 0.92−1.04. Thus, for 40% of the period, the shock front velocity decreases by a factor of more than three. Panel b: evolution of maximum values of F_r(φ)∕F_r(1.04) ratio plotted with a cubic spline interpolation curve. In the phase interval φ = 0.90−0.92, the F_r ratio decreases much more than in the phase interval φ = 0.92−1.04. The flow of radiative losses increases rapidly with the speed of the shock front.