DR R. CLARK & M.R. GOFF / SCIENCE PHOTO LIBRARY DR R. CLARK & M.R. GOFF / SCIENCE PHOTO LIBRARY
The colour coding represents the temperature of the skin, ranging from white for the hottest parts, through red, orange, green and blue to purple for the coolest parts. The hot V-shaped white area on the boy's back is typical of young children. Note also the loss of heat from the man's bald spot (red & yellow) in the image at bottom left.
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