| http://www.w3.org/ns/prov#value | - The spacing information in respect of the relative position of the catheter tip 30 between the walls for example of a blood vessel, such information being obtained from the spacing signals, is represented by the display unit 38 in such a way that a symbol 40 for the tip 30 of a catheter is represented in a display area 42 whose outer boundary 44 represents the wall of the blood vessel in which the
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