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When the user returns to edit the water quality tables and series in the External Forcing Data tabtab, EFDC_Explorer displays all 21 WQ parameters. In the MASS Loadings option these parameters are depth-averaged and not layered, and so are vertically constant. However, after converting to concentrations loadings, the user is informed that the values have been converted, and now are now stored layer by layer. Initially, these values will be an average as calculated by EFDC_Explorer, but the user can now specify certain layers and assign new values as required.