... 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 . SAS is released periodically. ... 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. ... Pages maintained by SAS librarian . ...