Trajectories in the CR-E plane of two subsequent individual bursts of the A8b (top panel) and E5 (bottom panel) time series. Green filled circles and blue and red ellipses are the mean trajectories and the best fits as in Fig. 4; black lines connecting consecutive points track individual bursts, with the exception of the first “anomalous” burst in the bottom panel plotted as a violet dashed line. In the upper panel the thick black portions of the line connecting data points mark the sections used to measure the HXD₁ (magenta) and HXD₂ (orange).