Square shoulder + square well model

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The Square shoulder + square well model consists, as its name suggests, of a combination of the square shoulder model and the square well model. The model is given by

$\Phi_{12}\left( r \right) = \left\{ \begin{array}{ccc} \infty & ; & r < \sigma \\ \epsilon_1 & ; &\sigma \le r < \lambda_1 \sigma \\ - \epsilon_2 & ; &\lambda_1\sigma \le r < \lambda_2 \sigma \\ 0 & ; & r \ge \lambda_2 \sigma \end{array} \right.$

where $Φ 12 (r)$ is the intermolecular pair potential, $ε 1$ and $ε 2$ are the well depths, $r$ is the distance between site 1 and site 2 where $r := |\mathbf{r}_1 - \mathbf{r}_2|$ , σ is the hard core diameter and $λ 1,λ 2 > 1$