PPS-FLEX in Wall-less Mode (IMAGE) American Institute of Physics Caption PPS-FLEX firing in wall-less mode in the PIVOINE-2g vacuum chamber. Credit CNRS/LAPLACE and CNRS/ICARE Usage Restrictions This image may be used only with appropriate caption and 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.