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When you click on the Polar Options button you will see the dialog where you can adjust the parameters for the radii and arcs drawn in the domain.

Notes:

- If the minimum radius is `0.0` and you specified to draw `10` arcs, say, you will only see `9` arcs because the first arc has radius `0` and is not drawn.
- You can use only numbers, not constants like Pi or expressions such as Pi - atan(1) in the text fields.

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