Partition of CF parameter space among differently degenerate ground states, as found from numerical calculations in the absence of spin-orbit interaction. The possible ground states are denoted according to their total spin and the absence (2S + 1 A) or presence (2S + 1 E) of orbital degeneracy. They will be further specified in Figure 3 .
Partition of the B 20/B 44 − B 40/B 44 plane among all possible permutations of the four one-electron CF levels.
Temperature dependence of reciprocal susceptibility. Closed circles are experimental data, 21 solid line is 1.22 times the calculated χ−1.
Values of coefficients in Eq. (17) .
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