1 2 3 4,5 6–8 6 4 9 , 10 Figure 1 10 K a 6 11 , 12 10 Figure 2 5 via F N→U F N→I F I→U Figure 2 5 F I→U et al. 5 5 via Figure 3 13 14 15 6 , 7 , 11 , 13 , 16 , 17 6 −1 −1 18 , 19 ab initio