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Total and free SO2 levels (mg/L) in Verdejo wines before bottling and those storage for one year under the different conditions tested. SUP: super quality natural corks; THR: third quality natural corks; MGR: microgranulated corks. Different letters (a,b,c,d or x,y,z) in the same variable mean significant differences (α = 0.05) according to the test of Student–Newman–Keuls.
