Fig 1 (IMAGE) Siberian Federal University Caption Correlation between the calculated and certified values of cryolite concentration for control materials. CR -- certified values of control samples; SGA CR -- calculated values, SD -- standard deviation. Credit Igor Yakimov Usage Restrictions None License Licensed content Disclaimer: AAAS and EurekAlert! are not responsible for the accuracy of news releases posted to EurekAlert! by contributing institutions or for the use of any information through the EurekAlert system.