Contact-only (COM) and dipolar-only (DOM) mixtures of the lanthanide shift reagents were prepared based on the Fi and Gi values deduced using individual Ln$(fod)_3$ (Ln = Pr, Nd, Eu, and Yb) and 4-picoline. The $F_i$ and $G_i$ values obtained directly by COM 1 and by DOM 1, which were appropriate mixture of Pr$(fod)_3$ and Eu$(fod)_3$, agreed well with those values obtained by experiments using individual Ln$(fod)_3$ shift reagents. Ei and Gi values obtained directly by COM 2 and by DOM 2, which were mixtures of Nd$(fod)_3$ and Yb$(fod)_3$, deviated from the expected values. The error was traced to the behavior of the ytterbium complexes.