CME kinematics derived from combined measurements. Top panel: distance of the eruption from the solar limb measured with STEREO-A EUVI 195 Å filter and the COR1 and COR2 coronagraphs. Points with error bars show the measurements and their standard deviation. The black line indicates the smoothed height–time profile. Middle panel: CME velocity obtained from the numerical derivate of the height–time profile. Bottom panel: CME acceleration obtained from the numerical derivate of the velocity profile. The dots in panels b and c show the numerical derivatives, the solid lines the smoothed profiles. The shaded areas represent the error ranges. The STIX 15–25 keV light curve binned over 20 s is shown in blue in the background.