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In image reconstruction, the object is represented by a grid of pixels (picture elements) in two dimensions or voxels (volume elements) in three dimensions.
The mean number of water molecules contained in a definite volume is obtained by summing up the local density over all contributing voxels .
The internal voxels were then discarded, leaving the object surface only.
The values presented are the mean of nine voxels taken from the longitudinal images as shown in Figs 5 and 7.
A small portion of the image surrounding one of the z lines, as indicated by the box in Fig.1 B, was magnified so that individual voxels could be seen.
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