Bootstrap test statistics. Each graph shows the Pearson coefficient distribution for parameter pairs for bootstrapping 40 planet pairs in 10⁵ simulations. From left to right the correlation is calculated for radii, masses, densities of adjacent planets in pairs and period ratios in triples. In the “mass” graph the blue dashed line indicates the “high-correlated” subsample for planets around cool stars (2566-4398 K). In the “density” graph the blue dash-dotted and black dashed lines indicate the “high-correlated” subsamples for planets around stars with metallicity ([Fe/H] ∈[−0.210; −0.010]) and old stars (6.03-12.3 Gyr) respectively.