The relationship between distribution levels (contour lines/zones) and the Chart3DContourStyles 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:
- In the Properties window, expand the ChartGroups node.
- Press the ellipsis next to ChartGroupsCollection to display the Chart3DGroup Collection Editor.
- Expand the Contour node.
- Press the ellipsis next to Levels to display the Chart3DContourLevel Collection Editor.

- Add, remove, or modify levels as desired. For more information, see Contour Style Appearance Properties.
See Also
Modifying Header and Footer Titles