The bare nucleus TH S_b(E)-factor of Lattuada et al. (2001) (black points), normalized to the direct ones of Cruz et al. (2005, 2008) (red and blue circles, respectively) via the renormalization constant k. The direct measurement of Engstler et al. (1992) is also reported (open diamonts). The full line describes the TH S_b(E)-factor while the dashed line is the fit of the low-energy (<60 keV) direct data of Engstler et al. (1992), giving U_e = 425 ± 60 eV.