A method for adjusting an optical axis of an imaging optical system is provided. In a power fiber amplifier unit, having a fiber pre-amplifier and a fiber power amplifier, the gain tilt of the fiber power amplifier is generally set by the level of gain saturation. The control information may include a plurality of first division information for identifying first division units respectively so as to divide each of the plurality of audio information recorded on the audio information recording area by the first division units respectively. A sequence of values is used to produce an index into a table that stores secondary search results. The preparations have advantageous properties when reconstituted for injection. The neural stimulation pulses are delivered to one or more nerves to control the physiological functions regulated by the one or more nerves.