The upper part of the window has three boxes with important information
about the current event:
Ecms: The collision energy (in GeV) for the current event.
Number of Tracks: The number of detected particles in the current event.
Energy: Detected/measured energy (in GeV) for the current event. If the energy
of all particles in the event is measured correctly, then should the measured energy be
equal to the collision energy (the incoming energy).