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Using molecular dynamic simulations we study a system of particlesinteracting through a continuous core-softened potentials consisting of a hardcore, a shoulder at closest distances and an attractive well at furtherdistance. We obtain the pressure-temperature phase diagram of of this systemfor various depths of the tunable attractive well. Since this is a two lengthscales potential, density, diffusion and structural anomalies are expected. Weshow that the effect of increasing the attractive interaction between themolecules is to shrink the region in pressure in which the density and thediffusion anomalies are present. If the attractive forces are too strong,particle will be predominantly in one of the two length scales and no densityof diffusion anomaly is observed. The structural anomalous region is presentfor all the cases.

Effects of attractive interactions in the thermodynamic, dynamic and structural anomalies of a two length scale potential