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When you click on the Global Options button you will see the dialog where you can adjust the minimum and maximum values of the real (x) and imaginary (y) parts of the domain and the range. You may not use constants such as `Pi` or computed values such as `Pi/2-atan(1)` here. If you want to undo your changes, click the domain undo or range undo buttons on the toolbar.

> Tip: An easier way to adjust the dimensions for domain and range is usually to zoom in or out or to pan (see zooming and panning)

You can also adjust the Points per Line to specify the number of points used for graphing the individual curves. Higher numbers yield smoother curves but also take slightly longer to compute. Finally, you can specify the background color to use (dark or light).

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