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Wetting-length dynamics for right and left eyes of subject 15. Closed symbols reflect sheathing. Open symbols correspond to unsheathed strips. Slopes of the straight lines drawn after 3 minutes give the BTPR. Wetted lengths cannot be assessed below the dashed horizontal line due to visibility limitation. BTPRs are not available for unsheathed strips because of evaporation. Error bars represent the precision of the Schirmer-strip markings.
