The observed magnetic anisotropy and the isotropic NMR shifts in the CoTp 2 complex are theoretically well modeled by Jesson and McGarvey by including the state-specific Curie and Van Vleck paramagnetic contributions of the low lying KDs in Fig. . As the VV approach also includes the magnetic contributions from all the low lying KDs in a statespecific manner, the calculated ∆ χ ax according to this approach i.e. ∆ χ VV ax best fit with the experimental value. However in contrast, as shown in Table , ∆ χ ax in the two-KDs according to the mPV and BB approaches are quite overestimated from the experiment. Extending the pseudospin space upto three-KDs however greatly reduces the magnetic anisotropy (∆ χ ax = 4.93×10 -8 m 3 mol -1 ) as the effective g-tensor becomes more isotropic (see Table ) due to partial cancellation of the the state-specific anisotropic contributions from the individual KDs. As a result, the magnetic anisotropy in the three-KDs space is primarily from the ZFS, similar to Bleaney's equation for the lanthanides .