Noble-gas concentrations, noble-gas isotope ratios and standard errors (at the 1σ level) measured in blood samples from two subjects (S1 and S2). ASW (S1) = noble-gas concentrations in air-saturated water at a temperature of 36.5°C, a salinity of 9 g/kg and an altitude of 225 m above sea level (c

ASW (S2)  =  noble-gas concentrations in air-saturated water at a temperature of 37.5°C, a salinity of 9 g/kg and an altitude of 490 m above sea level (corresponding to an atmospheric pressure of 955.5 hPa). STP  =  standard temperature (0°C) and pressure (1 atm = 1013.25 hPa).