The authors of the paper (IMAGE) University of Groningen Caption The authors of the paper: Qikai Guo, César Magén, Marcelo Rozenberg and Beatriz Noheda. Credit University of Groningen Usage Restrictions Credit must be given to the creator. Adaptations must be shared under the same terms. License CC BY-SA 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.