In one embodiment, a network device may receive an mtrace query, where the mtrace query identifies two or more multicast routing paths. The method involves a trading strategy which operates on two levels, based on sets of at least three simple moving averages, including back testing to establish a decision base for decision making. The amplifier circuit amplifies an input signal to an output signal according to a predetermined gain and the AGC circuit is connected to the amplifier circuit for regulating the predetermined gain. The second communication port is connected to a receiving section of the first communication system. The perspective image has a viewpoint different than single collected image.