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For T → T$_{c}$ we have ξ − 1 b → 0, and using ξ − 1 b ≪ κ we obtain the approximation 

For z ≪ ξ$_{b}$ the above takes the simple form 

The correction term changes sign for z$_{0}$ ≈ 1 /κ . 

Equations for the first corrections to the nonelectrostatic part read 

where v (2) = ( ϑ $^{(2)}$, η$^{(2)}$), and the components of the vector D T = ( D$_{s}$, D$_{ρ}$ ) are 

<img src='content_image/359327.jpg'>

<img src='content_image/359326.jpg'>

<img src='content_image/359324.jpg'>

<img src='content_image/359323.jpg'>

<img src='content_image/359325.jpg'>

