Figure 3

\(|F_\mathrm {obs}|^2\) vs \(|F_\mathrm {calc}|^2\) plot for (a) 120 K and (b) 4 K. (c) The magnetic contributions \(||F_\mathrm {obs}|^2 - |F_\mathrm {nuc, calc}|^2|\) plotted as a function of the calculated squared magnetic structure factor \(|F_\mathrm {calc, mag}|^2\) at 4 K. The plot only includes the reflections that satisfy \(||F_\mathrm {obs}|^2 - |F_\mathrm {nuc, calc}|^2| > 3\sigma\) and \(I(4~\mathrm {K}) - I(120~\mathrm {K}) > 3 (\sigma (4~\mathrm {K})^2 + \sigma (120~\mathrm {K})^2)^{1/2}\). The refinement parameters are listed in Table S1.