Figure 3.

Plots showing (a) horizontal image dimensions, (b) position of anterior marker, (c) position of right marker, and (d) position of left marker relative to the gold standard image (described in text). It should be noted that all shifts seen in (b) to –(d) are to the right (taken as positive in our convention). Some data points are missing [e.g., 10–50 mm in (b)] because the marker tubes were not uniformly filled with gel.