Abstract
Our balloon-borne germanium ..gamma..-ray telescope has been reflown over Alice Springs, Australia. The detection of a sharp 511 keV electron-positron annihilation line from the galactic center (GC) direction has been confirmed at a flux level compatible with our previous result. No evidence for several other candidate lines was found, indicating that they were statistical fluctuations in the previous data. Evidence for a significant change in the GC inverse power-law continuum has been obtained, suggesting that its origin lies in the many unresolved and highly variable pointlike X-ray sources in the field of view.
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