For each grid size, the sparations 3.0, 3.1, and 3.2 have two plots one of curvature versus theta and one of y versus z of the surface.
All plots are snapshots of the data, usually at the last time step.
This is beyond the critical separtion, therefore, no single apparent horizon exists to envelope both masses in this system. The plot to the left is the y versus z surface plot showing the instability that arises when there is not a single minimal surface. This separation should be near the critical separation beyond which there is no longer a single horizon. The critical separation is surpassed and the code contains instabilities as two surfaces are not necessary to obtain zero curvature as expected on the apparent horizons. The instability grows starting from the center of the two masses.