Daily mean time series of (a) facial frostbite time and (b) facial frostbite time deficit. Measured at the South Col of Mount Everest from May to December 2008. The thick solid lines represent monthly mean values, while the thick dashed lines represent the first and third quartiles.
Moore et al. Extreme Physiology & Medicine 2012 1:2 doi:10.1186/2046-7648-1-2