Regions in the ζ_d2g–St phase space that are subject to the development of a streaming instability (in green) and that are stable against a streaming instability (in brown). The corresponding data are taken from Yang et al. (2017). The blue dots present our data for the ξ = 5% model and the numbers show the percentage of time spent by this model in the unstable and stable regimes. The cyan dots present the corresponding data for the ξ = 95% model.