| http://www.w3.org/ns/prov#value | - The axis of the spherical coordinate system can be chosen such that the database QRSI corresponding to the left ventricular apex has ??=0. r is an estimate of the total energy content of the map, and may be discarded if S is star-convex with respect to the origin of map space, as this also implies that only the pattern of the QRSI contains information about the site of origin.
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