Drag the torus to rotate it. Move the sliders to change the model parameters; use the additional controls to adjust the surface radii, cross-section, and viewing angles.

About the model. This figure shows the explicit model used in Figure 1 of Counterexamples to Grad's conjecture. The nonlinear correction is omitted. The initial eccentricity is enlarged for visibility and lies outside the theorem's small-eccentricity regime. The slider ranges allow exploration of the model; they do not assert that the theorem applies at every setting.

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