In general, a vibrating string does not vibrate in a single harmonic mode. The motion is a superposition of several harmonics. The wave function is a linear combination of harmonic functions , where and are constants determined by initial conditions of the problem. The initial shape of the string is shown in the lower plot when . It is symmetric about the point and initial velocity zero throughout the string. The movement of the string after being released is still symmetric with respect to . Only the odd harmonics ( odd) are excited. The even harmonics are null with .