Table 4. The mean analytical difference (ΔTCO2 = measured - certified) and the standard deviation of the differences between measured and certified TCO2 on WOCE Sections AR24, A24, A20, and A22
Section	System S/N	ΔTCO2 (µmol/kg)	St. dev. (µmol/kg)	n
AR24	004	1.42	2.10	16
AR24	030	1.54	1.88	49
Mean/total		1.51	1.92	65
A24	004	0.04	1.10	49
A20	004	0.23	1.20	42
A22	004	0.06	0.69	17
Mean/total		0.10	1.08	108
A24	030	0.79	1.00	48
A20	030	0.44	1.43	35
A22	030	0.26	1.22	19
Mean/total		0.57	1.21	102
Overall mean/total		0.61	1.47	275