Illustration of Galactic potentials used in the simulation of stellar orbits. The left column shows the complete gravitational potential, and the following columns show the potential of the bar, disc and the halo. The black line shows the orbit of the Sun for the last 750 Myr. A small dip close to the present position of the Sun is the gravitational potential of a simulated cluster, amplified one million times. Magnitudes of different potentials are not plotted to scale.