The data file that contains a user-defined template (UDT) is similar to a data file produced during a normal Ansys Polydata session. The only difference is the identification of parameters. All parameters that you want to be able to access in the simplified Ansys Polydata interface must be identified (or flagged) in the UDT data file. The process of flagging a parameter is similar to defining a parameter as a function of time or evolution variable, in a typical Ansys Polydata session.