The Model's Results (IMAGE) Ecole Polytechnique Fédérale de Lausanne Caption This is a graph showing the modeled results and the actual data -- close to a couple nanograms per liter. Credit EPFL - Sylvain Coutu Usage Restrictions Credit 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.