 For amplitudes up to 15 or 20°, the velocity of a saccade linearly depends on the amplitude (the so-called "saccadic main sequence", a term borrowed from astrophysics; see Figure).For amplitudes larger than 20°, the peak velocity starts to plateau (nonlinearly) toward the maximum velocity attainable by the eye at around 60°.For instance, a 10° amplitude is associated with a velocity of 300°/s, and 30° is associated with 500°/s.