Stellar aggregate orbits on the Galactic plane for three values of f. From left to right f = 0.1, 0.3, 0.5, resulting in stronger density and potential perturbations. The different curves are orbits for different initial conditions extracted according to observed error distributions. The W345, LISCA I, and LISCA II orbits are in orange, purple, and green, respectively. Present-day positions are also shown with filled symbols.