CTA expected performances in the reconstruction of the intrinsic spectral model. Top panel: D₁₀ = 10²⁶ cm² s^-1, δ = 0.4, γ = 2.3, η = 1/3. Bottom panel: D₁₀ = 10²⁸ cm² s^-1, δ = 0.6, γ = 2.1, η = 1. The blue points illustrate one of the possible realizations of the simulated spectral points from 50 h of CTA observation time, the red line identifies the intrinsic spectrum and the black lines represent the accepted models (χ²/d.o.f. + 1). The red intrinsic spectrum is superimposed to one of the accepted models, which, for the case shown in the top panel, is superimposed to the only accepted model.