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. 2011 Mar 29;2(4):996–1006. doi: 10.1364/BOE.2.000996

Fig. 7.

Fig. 7

Distribution of blood-pulsations amplitude (a, c) before and (b, d) after gentle scratching of the palm of (a, b) subject A and (c, d) – subject B. The scales show the absolute value of the components of the correlation matrix SC(x,y), which are different for different subjects.