The workflow in Figure Figure illustrates the model uncertainties across the entire DFT-dataset for all 53 reactions, obtained over seven concurrent training iterations. In this analysis, we focus on configurations with a maximum force on each atom below 2 eV/Å, as these are more likely to yield valid transition state geometries. Notably, while the median values of ϵ t drop rapidly to below 0.5 eV/Å after the very first iteration, the tails of the distributions at higher ϵ t decrease at a more gradual rate.