Results of the barycentre computation for the event presented in Fig. 3. In all panels, the black points and lines represent the results of the computation over the net measured counts ${\overline{C}}_{xy}$, whereas the red ones are the results of the Gaussian fitting of Eq. (1) (as for Figs. 3c,e). During the analysis, both of these versions are computed for a consistency check and a posteriori verification of the goodness of the fit. In this case, the two results are completely overlapping. (a) Map of the pixels corresponding to the projected meteor track, with the arrow indicating the apparent motion direction on the PDM. (b) Barycentre x positions of the meteor from the FOV centre computed from Eq. (3) (dots with error bars) as a function of the GTU index and converted to km assuming an altitude of the meteor of H = 100 km from the ground level. The result of the linear fitting is plotted by the solid lines. (c) Same as panel b but for the y positions.