Normalized amplitude profiles A( r)/Σ ₀( r) of unstable modes A ₁ and A ₂ for model 1 in Table 2. Top: classical KBOs reside at the accumulation point, and we have set . The current semimajor axes of the orbits of Saturn and Neptune are indicated by vertical dotted lines. Bottom: unstable modes are fit to the inner solar system with . The mean semimajor axis of the most populous asteroid belt and the present semimajor axes of the terrestrial planets have been indicated by vertical dotted lines.