(a) Power spectra of the reduced eligible TG flow (red closed circle) and effective ineligible TG flow (blue closed circle) extracted with p = 25 from the Optimal model v^P_H at 1980.0. Power spectrum of v^P_H is also plotted (black open circle). (b) Power spectrum of the SVs at r = a predicted by (red closed circle) (blue closed circle) at 1980.0. Power spectrum of the gufm1 SV model at 1980.0 is also plotted (black open circle). The SV powers predicted from are lower, or at least no higher, than those calculated from the SV error evaluated as nT² yr⁻² (grey diamond).