Transformation of normal distribution through data processing. Axes: vertical – relative frequency (%), horizontal – results. Red lines show Normal fits. A: At CPs' CV 0.5% the deviations from normality were not detectable using the Kolmogorov-Smirnov test. B: At CPs' CV 1% the deviations from normality were not detectable in non-normalized values though moderate deviations were detectable in final results. C: At CPs' CV 2% deviations from normality were detectable in both non-normalized values and in final results.