We investigate the ability of the reference hypernetted-chain integral equation\udto describe the phase diagram of square-well fluids with four different \udranges of attraction. Comparison of our results with simulation data \udshows that the theory is able to reproduce with fairly good accuracy a \udsignificant part of the coexistence curve, \udprovided an extrapolation procedure is used to circumvent the well-known \udpathologies of the pseudo-spinodal line, which are more severe at \udreduced width of the attractive well. The method provides a useful \udapproach for a quick assessment of the location of the liquid-vapor \udcoexistence curve in this kind of fluid and serves as a check for the \udmore complex problem of anisotropic ``patchy'' square-well molecules.
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