... Software requirements . ... The Science Analysis Software (SAS) is an extensive suite of software tools developed to process the data collected by the XMM-Newton Observatory . ... Within these pages you may find all the information needed to download, install and start using SAS. ... The XMM-Newton SAS is developed and maintained by the Science Operations Centre at the European Space Astronomy Centre (ESAC), Madrid, Spain and the Survey Science Centre at the University of Leicester, Leicester, UK. ...