Comparison of structures from K14 and G18. Top left: histogram of the size of NESTs (red) and the structures from K14 and G18 in kilo astronomical units. Top Right: histogram of relative average density and the structures from K14 and G18. Bottom: grey bars show the average ratio, f̄_C0/I, in each region, with small horizontal dotted lines showing the limits f̄_C0/I ± σ_fC0/I. Red (resp. black) dots show the median values of f_C0/I from the relative-risk maps in the area occupied by the convex hull of NESTs (resp. structures from K14 and G18), with error bars representing the first and third quartiles. Solid red (resp. black) lines join the median values of f_C0/I for NESTs (resp. K14 and G18) to help compare the values. Finally, vertical lines separate the HRA, IRA, and LRA regimes.