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A model for the radial distribution function $g(r)$ of a square-well fluid ofvariable width previously proposed [S. B. Yuste and A. Santos, J. Chem. Phys.{\bf 101}, 2355 (1994)] is revisited and simplified. The model provides anexplicit expression for the Laplace transform of $rg(r)$, the coefficientsbeing given as explicit functions of the density, the temperature, and theinteraction range. In the limits corresponding to hard spheres and sticky hardspheres the model reduces to the analytical solutions of the Percus-Yevickequation for those potentials. The results can be useful to describe in a fullyanalytical way the structural and thermodynamic behavior of colloidalsuspensions modeled as hard-core particles with a short-range attraction.Comparison with computer simulation data shows a general good agreement, evenfor relatively wide wells.Comment: 23 pages, 10 figures; Figs. 4 and 5 changed, Fig. 6 new; to be  published in J. Chem. Phy

A square-well model for the structural and thermodynamic properties of simple colloidal systems