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If the calculation process fails, the message “Error in 7 parameters calculation” appears. If the calculation is successful, the results are shown in the Datum Parameters and Transformation Residuals window. By default, the transformation residuals are computed in the NEU system. To change the NEU to the XYZ-system, right-click somewhere in the Transformation Residuals panel and select the XYZ type. The transformation residuals may be shown in table format. For this, press the table button. The following window will be opened: Show By default, the residuals in this table are displayed in the same format that has been selected for the graphic representation. To change the format, right-click somewhere in the Transformation Residuals window and select the format needed. The analysis of the transformation residuals helps the user detect possible blunders in the WGS84 or local coordinate sets. The user can identify the points having critical or abnormal residuals. To check on a “suspicious” point, exclude this point from both the lists and re-compute the transformation parameters. If the updated residuals look satisfactory and the problem appears to be fixed, then this indicates that it was indeed a 74