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. 2000 Aug 1;116(2):191–210. doi: 10.1085/jgp.116.2.191

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© 2000 The Rockefeller University Press

This article is distributed under the terms of an Attribution–Noncommercial–Share Alike–No Mirror Sites license for the first six months after the publication date (see http://www.rupress.org/terms). After six months it is available under a Creative Commons License (Attribution–Noncommercial–Share Alike 4.0 Unported license, as described at http://creativecommons.org/licenses/by-nc-sa/4.0/).

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Constancy of field centroid position in pairs of standard sessions. (A) Displacement vectors for 87 fields. In general, the vectors are quite short, indicating that the field centroid position was reproducible. In addition, there is no organization to the vector directions; displacements of neighboring fields are unrelated to each other. (B) In agreement with the impression gained from the displacement vectors, plots of the angular (1) and radial (2) vector components reveal no tendency for fields in certain angular ranges to move in coordinated fashion. Note that both the displacement vector presentation and the vector component plots show a higher than expected density of fields along the radius aimed at the clockwise white card edge, especially near the cylinder wall. The origins of this apparent inhomogeneity are unclear.