Relations between the logarithm of the mass fractions in m₁ (two left columns) and the IGL (two right columns) at the end of the simulations and various magnitude gaps defined from the first six ranked galaxies in the groups. Each panel displays the Pearson r coefficient and associated p-value, with dotted black lines indicating the best linear fit. Weak or statistically insignificant linear correlations should not be taken as evidence of a physical link. The colours and shapes of data points identifying group classes follow the same scheme used in Fig. 2.