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![In Fig. 5b, taken at around 221 km distance, two different arcs detected close together are shown. If the The measurement chain, shown in Fig. 4, can be roughly divided into two main sections: the upper one includes the phototube and the related supply devices, the lower one represents the data-acquisition system. The acquisition system can be controlled from a master workstation located inside the measurement coach. The acquired data are available on board for an on-line analysis or for an off-line post-test evaluation [12]. A software package was devel-](https://figures.academia-assets.com/49618550/figure_004.jpg)
