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The collectivity factor, κ (see Eq. 4), as a function of eigenvalue, λ. The lack of a gap in λ and κ between the largest five modes and the remaining modes demonstrates that the internal and overall motions are inseparable. Eigenmodes with the five largest eigenvalues, which would correspond to the overall rotation for a molecule in which the internal and overall motions are separable, are marked by the dotted ellipse.
