Institution: | N. Copernicus Astronomical Centre, Bartycka 18, 00-716 Warszawa, Poland;University of Durham, Department of Physics, South Road, Durham DH1 3LE;Astronomical Observatory, Jagiellonian University, Orla 171, 30-244 Kraków, Poland;E. O. Hulburt Centre for Space Research, Code 7650, Naval Research Laboratory, Washington, DC 20375, USA;Laboratory for High Energy Astrophysics, NASA Goddard Space Flight Centre, Greenbelt, MD 20771, USA |