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. Author manuscript; available in PMC: 2011 Apr 1.
Published in final edited form as: J Biol Rhythms. 2010 Apr;25(2):113–122. doi: 10.1177/0748730410361916

Figure 1.

Figure 1

Average ± SD distribution of light threshold levels (<10 lux, 10 to <100 lux, 100 to <1,000 lux, ≥1,000 lux) in older (black bars) and young (white bars) subjects across the waking day.