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. 2007 May 2;91(11):1464–1466. doi: 10.1136/bjo.2006.112680

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Figure 2 Mean grades for three eyes given from (A) edge detection (ED) and (B) relative colour extraction (RCE) image analysis for n = 45 successive images of increasing hyperaemia. Error bars  = 1 SD of three inter‐subject analyses.