Table 6. The mean gas calibration factors (CALFAC) obtained during the WOCE Section P6.

Leg	Cells(n)	CALFAC Mean ± S.D.	Carbon Age Mean ± S.D. (MgC)
System 004 (CRM-based calibration)
P6E	21	1.004037 ± 0.000777	10.1 ± 9.3
P6C	21	1.003932 ± 0.000538	10.9 ± 8.3
System 006 (pure-CO2 calibration)
P6E	24	1.004632 ± 0.000555	5.4 ± 1.6
P6C	30	1.004535 ± 0.000988	8.5 ± 3.2
P6W	18	1.004129 ± 0.000755	6.7 ± 1.8