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\section{User Models and Templates}  \label{sec:usermodels}  Keeping with our requirements of developing an extensible SED analysis tool, we provide a user-end interface for adding custom models, templates, and template libraries for the fitting engine to use in a Custom Fit Models Manager.Other widely-used SED fitting programs (EXAMPLES) offer these features as well.  Sherpa, Iris' fitting engine, provides \textbf{command line functions} for users to add their own models and templates to a Sherpa session. We wrap a GUI around Sherpa's \texttt{sherpa.astro.ui.utils} functions \texttt{load\_user\_model}, \texttt{load\_table\_model}, \texttt{load\_template\_model}, and \texttt{add\_user\_pars} for streamlined integration and user-friendliness. The user provides the full path to the directory where the models and templates exist, as well as information about the parameters. Installing a model saves a copy of the model files in the user's home directory (in \~{}/.vao/iris/components), allowing the user to apply the models in future sessions.