See AER/AGS DIG 2020-0006 (data points) for details on the vertical accuracy of the input data, which is affected by the locational accuracy of the wells.
The following statistics describes the accuracy of the final grid:
Root mean square error = 23.78
Mean error = 0.245
Mean standardized error: 0.014
Root mean square standardized: 0.659
Average standard error: 34.54
Method Report:
Method: Kriging
Type: Ordinary
Output type: Prediction
Trend type: None
Variogram: Semivariogram
Number of lags: 12
Lag size: 0.2218
Nugget: 985.5305
Measurement error percentage: 100
Model type: Stable
Range: 1.3836
Anisotropy: No
Partial sill: 35382.3826
Total points: 3153
Coordinate System: NAD_1983_UTM_Zone_11N
Datum: D_North_American_1983