F-UT of conductivity factors for the hemispheric indices. The top row is for northern hemisphere indices, the bottom row for southern hemisphere indices. The columns from left to right are for: (a) and (f) for the hemispheric an and as indices, P_ΣN and P_ΣS; (b) and (g) for the aσ_N(dawn) and aσ_S(dawn) indices, P_ΣN(dawn) and P_ΣS(dawn); (c) and (h) for the aσ_N(noon) and aσ_S(noon) indices, P_ΣN(noon) and P_ΣS(noon); (d) and (i) for the aσ_N(dusk) and aσ_S(dusk) indices, P_ΣN(dusk) and P_ΣS(dusk); and (e) and (j) for the aσ_N(midn) and aσ_S (midn) indices, P_ΣN(midn) and P_ΣS(midn).