Fig. 7From: Quantification of plasmid DNA reference materials for Shiga toxin-producing Escherichia coli based on UV, HR-ICP-MS and digital PCRComparison of UV (blue column), HR-ICP-MS (red column) and dPCR (yellow column) quantification results of three plasmid DNA RMs. The error bars represented the uncertainties of the methods, and the black dashed lines are the average concentration of the RMsBack to article page