Left panel: Shape asymmetry A_S versus compactness C of the neighbour distributions retrieved by ULISSE for all 290 target objects. The colour scale represents the aspect ratio R of each corresponding neighbour distribution. The black dashed lines corresponds to key values: compactness C = 1 separates compact (C < 1) from dispersed (C > 1) distributions, while shape asymmetry A_S = 1 corresponds to equal scatter in ℳ_* and SFR. Deviations from unity indicate dominant spread along either ℳ_* (A_S < 1) or SFR (A_S > 1). Right panel: Shape asymmetry A_S versus the ratio between mean and normalised mean distances of the neighbour distributions. Colour scale shows the two-dimensional scatter ∆₂D of the neighbours. The black dashed line indicates d_mean/d_norm = 1, i.e. cases where the normalisation to the ‘rarity’ of the target object in the sample has no effect on the mean position of the retrieved neighbours. Values significantly above 1 reflect targets located in sparsely populated regions of parameter space, where d_mean is biased due to the limited availability of similar objects. Marker symbols in both panels indicate the GZ2 morphological class of each target galaxy.