. XMM-Newton Science Analysis System . hkstrip (hkstrip-3.12) [xmmsas_20080701_1801-8.0.0] . Meta Index / Home Page . It would also be useful if this task could check all HK columns to see of they are constant throughout the HK data. If they are, the column could be deleted and replaced with a keyword value in the binary table extension, resulting in a potentially large space savings. XMM-Newton SOC/SSC -- 2008-07-01