[...]
			//
			// calculate the mean and standard deviation of the correction factors
			//
			
			// Add a new column to the worksheet for the mean correction factor
			int colNumMean = -1;
			string colNameMean = "mean";
			colNumMean = wksCalculation.AddCol(colNameMean);
			
			if( colNumMean == -1 )
			{
				log_file_text.Format("Error: Couldn't create new column \"%s\" in worksheet \"%s\"\n", colNameMean, short_name_calculation);
				WriteUserLogFile(log_file_text, TRUE);
				return;
			}
			
			// Add a new column to the worksheet for the correction factor standard deviation
			int colNumStd = -1;
			string colNameStd = "SD";
			colNumStd = wksCalculation.AddCol(colNameStd);
			
			if( colNumStd == -1 )
			{
				log_file_text.Format("Error: Couldn't create new column \"%s\" in worksheet \"%s\"\n", colNameStd, short_name_calculation);
				WriteUserLogFile(log_file_text, TRUE);
				return;
			}

			//
			// Go thru all columns (values of different configs) and calculate mean and std
			//
			
			// rows and cols begin at "1" for x-function arguments!
			
			int numRows = wksCalculation.GetNumRows();
			
			// use x-function "rowstats" to calculate:
			// example: rowstats mean:=[m01p02cor]Sheet1!mean sd:=[m01p02cor]Sheet1!SD  irng:=[m01p02cor]Sheet1!col(2)[1]:col(10)[25] 
			
			XFBase xf("rowstats");
			if( !xf.IsValid() )
			{
	    		log_file_text.Format("Error: Could not load X-Function \"rowstats\"\n");
	    		WriteUserLogFile(log_file_text, TRUE);
	    		return;
			}
			
			string strIRNG;
			strIRNG.Format("[%s]Sheet1!col(%d)[1]:col(%d)[%d]", short_name_calculation, 2, colNumMean, numRows);
			if( !xf.SetArg("irng", strIRNG) )
			{
				log_file_text.Format("Error: failed to set argument \"irng\" in X-Function \"rowstats\"\n");
	    		WriteUserLogFile(log_file_text, TRUE);
	    		return;
			}
			
			string strMean;
			strMean.Format("[%s]Sheet1!%s", short_name_calculation, colNameMean);
			if( !xf.SetArg("mean", strMean) )
			{
				log_file_text.Format("Error: failed to set argument \"mean\" in X-Function \"rowstats\"\n");
	    		WriteUserLogFile(log_file_text, TRUE);
	    		return;
			}
			
			string strSD;
			strSD.Format("[%s]Sheet1!%s", short_name_calculation, colNameStd);
			if( !xf.SetArg("sd", strSD) )
			{
				log_file_text.Format("Error: failed to set argument \"sd\" in X-Function \"rowstats\"\n");
	    		WriteUserLogFile(log_file_text, TRUE);
	    		return;
			}
			
			if( !xf.Evaluate() )
			{
				log_file_text.Format("Error: failed to execute the X-Function \"rowstats\"\n");
	    		WriteUserLogFile(log_file_text, TRUE);
	    		return;
			}