Long-term evolution of B_HMF between 1766 and 2001 (black line) as obtained by using the A(t) trend derived from the measured ⁴⁴Ti data. The 1σ (68.27%) and 2σ (95.45%) confidence bands (depicted with dark-gray and light-gray shaded areas, respectively) were obtained by propagating the uncertainties in the model (see text for details). The coloured curves are the sunspot-based (top), geomagnetic-based (middle) and ¹⁰Be-based (bottom) composite reconstructions of the B_HMF after passing through a 1, 4, 6, 4, 1 binomial filter as given by Owens et al. (2016a,b).