| http://www.w3.org/ns/prov#value | - At point 242 (about 1.25 inches in the present example), a very large force spike (e.g., as large a force as can be generated) is output based on a very high (or infinite) stiffness stored in the profile to create a ???virtual wall.??? This simulates a hard structure, such as bone, which the needle cannot advance through, and makes it apparent to the user that the needle must be retracted.
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