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Optimum intensity segmentation line fits (white) in log space (a) and intensity space (b) of 193 Å versus 171 Å, in log space (c) and intensity space (d) of 211 Å versus 171 Å, and in log space (e) and intensity space (f) of 211 Å versus 193 Å. Segmentation lines in log-space convert to curves in intensity-space, as described by equations (2) and (3).
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