We thank Claes Fransson for comments and stimulating discussions, and Bruno Leibundgut and the referee Tino Oliva for comments on the manuscript. We also thank Shigehiro Nagataki and Anil Pradhan for updating us on nuclear and atomic data, respectively. We acknowledge support from the ISOSDC at MPE. ISAP is a joint development by the LWS and SWS Instrument Teams and Data Centers. Contributing institutes are CESR, IAS, IPAC, MPE, RAL and SRON. This research was supported by the Swedish Natural Science Research Council, the Swedish National Space Board, and the Knut & Alice Wallenberg Foundation. A.P.S.C. is grateful for support from NASA grants NAG5-3319 and NAG5-3502.
© European Southern Observatory (ESO) 1999
Online publication: June 30, 1999