Evolution of (from top to bottom) the resonant angles φ_2,1c:2d, φ_1,1b:2c:4d, φ_{1,1b:2c:4d:8e} and ϖ_c−ϖ_d for system 94, simulation 4e. The black dots show the output from our simulation, sampled every 100 years. In the top panel (evolution of the φ_2,1c:2d) the output clusters around 0 rad, which is a sign of weak resonant behaviour. The system alternates between libration and circulation in this resonant angle, which is a different behaviour than what is seen in systems affected by strong resonance in which all output would be narrowly confined about 0 rad. None of the bottom three panels show signs of resonant libration, unlike in the cases considered by Goździewski & Migaszewski (2009, 2014). The red line indicates the estimated age of HR 8799.