Extended Data Figure 3: The lattice spacing dependence of the topological susceptibility χ obtained from three different methods described in the main text, namely standard, ratio and reweighting.

For the reweighting method, a continuum extrapolation is also shown. The plot shows lattice results with n_f = 2 + 1 + 1 flavours of staggered quarks at a temperature of T = 150 MeV. At this relatively low temperature the standard (‘brute force’) method still cannot provide three lattice spacings, which extrapolate to the proper continuum limit, though they correspond to very fine lattices with N_t = 12, 16 and 20. Error bars are s.e.m. and smaller than the symbols.