Chaotic orbital evolution of resonant and non-resonant asteroids. The standard deviations of the proper eccentricities (a) and inclinations (b) increase with time. The scatter represents the standard deviations of different test particle groups within each period (32 000 yr). The resonant groups are depicted in color, while the non-resonant group is shown in black. The scatter between two black vertical dashed lines is used to fit the log-linear function (discarding the output of the previous 10 Myr).