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Optical signatures of three different subjects (a-c), dry skin (blue) from the left forearm against moist skin (orange) from the right forearm after moisturizer application. The amplitude speckle shift in frequency domain is the optical parameter, as a function of the 6 frequencies examined. Five independent measurements were taken from the three subjects, each time from both forearms. Here is presented the average accepted values, with standard deviations of the five repetitions.
