# Duh Haymet

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$B(\gamma^{*})= - \frac{1}{2} \gamma^{*2} \left[ \frac{1}{ \left[ 1+ \left( \frac{5\gamma^{*} +11}{7\gamma^{*} +9} \right) \gamma^{*} \right]} \right]$
where (Eq. 10) $\gamma^{*}(r) = \gamma (r) - \beta \Phi_p(r)$ where $\Phi_p (r)$ is the perturbative part of the pair potential (Note: in the WCA separation for the Lennard Jones system, the `perturbative part' is the attractive part).