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When you click on the Rectangle Options button you will see the dialog where you can adjust the parameters for the horizontal and vertical lines drawn in the domain.

Notes:

- If you only want one line drawn, set the number of lines to 1. The line drawn is then defined by the value of the `From` parameter.
- You can use only numbers, not constants like Pi or expressions such as Pi - atan(1) in the text fields.

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