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. 2017 Sep 28;12(9):e0185469. doi: 10.1371/journal.pone.0185469

Fig 3. Relationship of seawater pCO2 and aragonite saturation state (Ωar) determined by four different methods: 1) CT and AT (n = 25), 2) spectrophotometric pHT and AT (n = 45), 3) electrode pHNBS and AT (n = 49), and 4) the direct measurement of seawater CO2 with a NDIR CO2 equilibrator (n = 46).

Fig 3