a−e diagram from the last Gyr of the benchmark model simulation incorporating gravitational interaction with Neptune. Q₂ = 1 (top left panel), Q₂ = 2 (top right panel), Q₂ = 4 (bottom left panel), and Q₂ = 6 (bottom right panel) were assumed. Two colours (transparency levels) are used as a proxy for two inclination ranges. The blue (less transparent) evolutionary tracks represent orbits with inclinations spanning i ∈ (10,30) deg, the interval the inclinations of Sednoids lie in. The grey (more transparent) tracks refer to all the other long-living orbits. Sedna and 2012 VP 113 are indicated as large dots. The dashed lines indicate q = 30, 50, 100, and 550 au levels (from right/bottom to left/upwards). Objects between the two left-most/upper-most lines (q in range between 100 and 550 au) would hardly be observed if they really exist.