Use the ID Interval node () to add a 1D extra dimension as a 1D interval.

To add a 1D Interval, under Definitions Library right-click the Extra Dimensions node and choose 1D Interval from the context menu.

Specify parameters by filling in the columns Name, Description, Default expression, and Read only.

Enter a Tag suffix.

In the table you can edit the First, Second, and Third Default coordinate names, which are xd1, xd2, and xd3, respectively.

Enter a value for the Left endpoint, Right endpoint, and the Number of mesh points.