The plot presents shear strength parameters with cohesion c in kilopascal on the horizontal axis from 0 to 30 and friction angle phi in degrees on the vertical axis from 0 to 25. A dense cloud of Monte Carlo simulation samples fills the central region, representing the joint distribution of c and phi. Several initial samples appear as distinct marked points within this cloud. A solid curved boundary labelled theoretical G x equals 0 runs from high phi at low c toward zero phi near c equals 15, separating safe and failure regions in the parameter space.