Probability density functions ρ_II(θ) (top) as well as cumulative probability functions (bottom) for the pixel corresponding to the slot position with x_id = y_id = 5 within the central fuel assembly for two different geometries. The red curve represents the geometry with a complete fuel assembly (all positions are occupied according to the nominative layout), while the black curve corresponds to the geometry where the specific slot position represented by this pixel is empty. The distributions represent results of a simulation with 10⁸ events assuming mono-directional muons with θ_in = 0°.