Example of a particle (yellow) interacting with a detector stack. The particle is able to pass through the first absorber (grey) and the first sensor (D1 – green) and stops in the second absorber. Depending on the particle species (electron, proton, or ion) and on the threshold of HGLT 1 and HGHT 1, it generates a signal (black) that may or may not activate the first pattern (or counter) but not the second.