For a study involving a $1$:$6$ scale model, it is required to maintain Froude number similarity. Additionally, the potential for cavitation needs to be evaluated, and it is assumed that the cavitation number must be the same for both the model and the prototype. The prototype operates in water at $20$C under an ambient pressure of $101$ kPa, while the model uses water at $60$C$.$ What should the ambient pressure of the model system be to ensure similarity