... This is the procedure to be used: . execute newsiam to obtain the rotation angles . store these angles into the CCF package xmm-siam , file siam.dat . ... in siam.desc you need to change the type from siam to boresight . ... execute make , which generates a CCF with the structure of a BORESIGHT file . execute ccfextseq / ccftools -sets=boresightfile , where boresightfile is the name of the file you just generated in the previous step . ...