gxMethod of Chipman et al., 1993. Values in moist air at listed temperature (~4°C).
Chipman, D., J. Marra, and T. Takahashi. 1993, Primary production at 47°N and 20°W in the North Atlantic Ocean: A comparision between the 14C incubation method and the mixed layer budget. Deep-Sea Res. 40:151-169.