Data objects are useful for storing data that is not directly applicable to a simulation object. For example, a data object can be used to hold system data. Custom slots can be created on data objects or on simulation objects. For example. custom slots can be created on the reservoir to hold historical reservoir data for easy comparison with the RiverWare results. Also, custom expression slots and statistical table slots can be used for post processing and analysis of the data. See Objects and Methods in Objects and Methods for details on data objects See Statistical Slots and Probability Plots for details on USACE‑SWD analysis tools.