  Various Monte Carlo techniques are used to determine the complete phase
diagrams of the square well model for the attractive ranges $\lambda = 1.15$
and $\lambda = 1.25$. The results for the latter case are in agreement with
earlier Monte Carlo simulations for the fluid-fluid coexistence curve and yield
new results for the liquidus-solidus lines. Our results for $\lambda = 1.15$
are new. We find that the fluid-fluid critical point is metastable for both
cases, with the case $\lambda = 1.25$ being just below the threshold value for
metastability. We compare our results with prior studies and with experimental
results for the gamma-II crystallin.
