Dependence of σ on the number of fibers with signal per event for stopping particles (blue) and minimum-ionizing particles (red). Values of σ_∆ϕ are multiples of the output resolution of the network (0.2°); σ_∆θ is calculated from ϕ and θ_proj. The number of fibers with signal can be larger than the depth of the ADU (32 fibers/layers) due to the emission of secondary particles (see Fig. 2).