MG acknowledges an ESA research fellowship. BeppoSAX is a joint Italian-Dutch program. The authors thank Dr. G. Matt for providing its XSPEC gradually changing index power-law model. Marco Beijersbergen made an invaluable contribution to the determination of the LECS response by adapting his XMM ray-trace to the BeppoSAX optics.
© European Southern Observatory (ESO) 1999
Online publication: December 22, 1998