Fractional probabilities, accounting for the relative abundances of the assembly histories of the corresponding satellites, that the magnitude gaps Δℳ₄₋₁ (left), Δℳ₅₋₁ (middle), and Δℳ₆₋₁ (right) take on a specific value at the end of the simulations. Transparent shaded bands show interquartile ranges for ex situ (blue), in situ (orange), and mixed (green) assembly modes, with solid lines indicating medians.