A method, apparatus, and computer implemented instructions for restricting a fan-out type search of a distributed database. The flexible sliding interface accommodates and seals against flat or irregular tissue and slides along a mating groove in the vacuum chamber to provide an adjustable seal. The film has a standard portion and an increased portion. 8\xd7Ta content ranges from 36 to 45 percent by weight, Zr content is 3 to 6 percent by weight, and the remainder is Ti and unavoidable impurities, excluding vanadium. The threshold combiner combines the transient feedforward adjustment with a lower speed BER feedback threshold adjustment for providing a decision threshold signal. A position detecting section detects a position, a specifying section which defines a region including an area forward in the traveling direction based on the detected position, and specifies a position in the defined region among positions stored in the content list.