= Manning condensed fraction
{c}
{title2=$f_c=\max(1-1/\eta,0)$}
In the mean-field infinite-dilution cylinder model, the fraction of neutralizing charge that remains localized is $f_c=\max(1-1/\eta,0)$, where $\eta$ is the <Manning parameter>. For $\eta>1$, integrating the <cylindrical counterion-only Poisson-Boltzmann profile> gives $Q_c=\lambda-q/\ell_B$. Below threshold, the local limiting density vanishes even though every finite neutral cell contains the full <counterion> charge.
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