Distribution of the (signed) normalised distance from first order mean motion resonances with k =2, 3 in all exoplanetary systems (yellow) and for three-planet systems (purple). We note a clear peak to the right of the value Δ = 0 (corresponding to the exact nominal resonance, indicated by a vertical orange line), which is most prominent for 0 < Δ ≲0.05. Out of the 358 pairs plotted here, there are 123 total pairs in this configuration. For the three-planets systems only, 48 pairs have 0 <Δ ≲ 0.05, out of the 121 shown in the purple histogram.