Restitution curves. A series of S1–S2 and constant BCL restitution curves superimposed on the dynamic restitution curve for β = 5 × 10-3 and α = 0.375. The range of excitation thresholds depicted, therefore, is from v
= 0.18 at T
= 37.7 to v
= 0.23 at T
= 27.7. The insert shows a close-up view of the S1–S2 restitution curve around the point T
= 29.4 where the S1–S2 curve is steeper than the dynamic restitution curve.