Long-term trend 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 colored curves are linear fits to the geomagnetic-based, sunspot-based and ¹⁰Be-based composite reconstructions of the B_HMF as given by Owens et al. (2016a,b).