A test specimen that has one or more chemical substances fixed to prescribed plural independent positions on a substrate, and the quantities of the chemical substances fixed at the respective prescribed positions are the total of integer multiples of existence quantity units defined for the respective chemical substances in the range from 1 amol to 1 nmol. The rotator switches having double buffered tandem nodes, multiplexing two or more sources onto each tandem node, partitioning the rotator into two or more parallel space switches, two or more rotator planes multiplexing fromto source and destination nodes to provide data path redundancy, priority queueing on source nodes scheduled locally or globally, or redundancy in the schedulers are shown. This system makes it possible to more easily deal with problems of roots in the sewers more quickly and, which makes it possible to reduce the cost. The level of each control factor is selected based on the measured minimum impulse \u2018X\u2019 and the measured maximum impulse \u2018Z\u2019.