Histogram distributions of argument of perihelion (top left panel), longitude of ascending node (top right panel), perihelion longitude (bottom left panel), and inclination (bottom right panel) inferred from the well-determined orbits of TNOs fulfilling the criteria 100 <a< 1500 au, q> 35 au (colour histograms). The orbits were discerned according to their a and divided into 3 groups: 100 <a< 150 au (yellow histogram), 150 <a< 250 au (blue histogram), and 250 <a< 1500 au (green histogram). The distributions inferred from all well-determined orbits of ETNOs (150 <a< 1500 au, q> 30 au) are indicated as dashed bars. The blue and green bars in a given bin can, but do not have to, sum up to the height of a dashed bar in that bin, as the dashed bar also comprises objects with q in the range from 30 to 35 au. The histogram bars are aligned to the left, for example, in the bottom right panel, 0 indicates inclination range (0,10) deg, 10 indicates inclination range (10,20) deg, and so on.