# Modifying Contour Levels

## Content



The relationship between distribution levels (contour lines/zones) and the [Chart3DContourStyles](/componentone/api/win/online-chart3d/dotnet-framework-api/C1.Win.C1Chart3D.4.8/C1.Win.C1Chart3D.Chart3DContourStyles.html) collection is as follows: if _nstyles_ contour styles are provided, and the number of distribution levels is _nlevels_, the index of the contour style associated with the _n_th distribution level is the largest integer less than or equal to the following:

`(n * (nstyles - 1) / nlevels) + 1`

### To modify the Contour Levels through the Chart3DContourLevel Collection Editor:

1.  In the Properties window, expand the **ChartGroups** node.
2.  Press the **ellipsis** next to **ChartGroupsCollection** to display the **Chart3DGroup Collection Editor**.
3.  Expand the **Contour** node.
4.  Press the **ellipsis** next to **Levels** to display the **Chart3DContourLevel Collection Editor**.<br />![](https://cdn.mescius.io/document-site-files/images/46396fd1-914e-43da-9cb0-e66dcc0ae61b/imagesext/image10_15.png)
5.  Add, remove, or modify levels as desired. For more information, see [Contour Style Appearance Properties](/componentone/docs/win/online-chart3d/3dcontourstyles/contourstyleappearan).

## See Also

[Modifying Header and Footer Titles](/componentone/docs/win/online-chart3d/chart3dforwinformsta/modifyingheaderandfo)