Figures 2a and 2b.
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Free SO2, total SO2 at 370 and 538 days. Stoppers B1 to B4; screw caps C1 to C4. Different labels (A, B, C, D, E) indicate means that significantly differ at p<0.0001. Averages and standard deviations are based on 3 bottles per procedure. fSO2: free SO2; tSO2: total SO2 in mg/L; d:day. Free and total SO2 at T0 = 27 ± 0/68 ± 0 mg/L.
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