| http://www.w3.org/ns/prov#value | - The amount of the offset in direction 580 may depend on various factors such as the material being tested (the velocity of sound in the material of tube 530), the diameter oftube 530, etc.As illustrated in FIG. 6, one component of the direction in which refracted beam 575 may travel may be a generally clockwise component that lies within the plane containing the cross section shown for tube 530.
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