Comparison of search results for the Hubble constant, H ₀, from the rule-based (a) and neural models (b). In addition to the measurements provided as central values with stated uncertainties (i.e., “x ± y,” shown as blue circles with error bars), the neural model figure also shows values given in the source text as constraints (i.e., H ₀ < x, or similar, shown as green arrows for lower bounds and orange arrows for upper bounds.)