Daily cycle of facial frostbite time at the South Col of Mount Everest. During (a) May (b) July and (c) October 2008. The dashed lines represent one standard deviation above and below the mean. Note the change in the scale for the various sub-plots.
Moore et al. Extreme Physiology & Medicine 2012 1:2 doi:10.1186/2046-7648-1-2