| Name | Value | Description |
| kMeanApproximation | 60674 | Mean approximation type. |
| kNeverTooThickApproximation | 60675 | Never too thick approximation type. |
| kNeverTooThinApproximation | 60676 | Never too thin approximation type. |
| kNoApproximation | 60673 | No approximation type. |