The default selection of "mydata" assumes that you have used the Data Tool
within TRAC Analyzer to create a data slice and have named it "mydata."
Note: "mydata" is the default name automatically assigned when you create a
special data slice -- unless you overrode the default by typing in a special name.
If you have previously created a data slice with a different name which you
wish to use, you need to type its name in the entry field.