Edit the estimated standard deviations for control points.
Measurements / View / 
/ All / Configuration / 
Click in a Sigma Easting, Sigma Northing or Sigma Height column and click 
- Control quality station coordinates.
| Control | Description |
|---|---|
| Sigma | Estimate of the coordinates standard deviation. |
- Error estimates can only be entered for points with coordinate class of Control (3D), Control (Horizontal) or Control (Vertical).
- Error estimates are only considered in a constrained adjustment.
- A minimum of two control points are required for a constrained adjustment.
- To edit multiple sigma values at one time, highlight multiple sigma cells and select .
- You can type a sigma value directly into the data grid control.
