Illustration Set Up (IMAGE) ETH Zurich Caption This illustration depicts the experimental set-up. The X-ray beam penetrates into the press with the sample and its interaction with the magma rock is recorded in an X-ray detector behind the press. The insert shows a typical absorbance map recorded by the detector from which the density of the sample is derived. Credit ESRF/Nigel Hawtin 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.