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Astron. Astrophys. 356, L13-L16 (2000) AcknowledgementsThe Westerbork Synthesis Radio Telescope is operated by the Netherlands Foundation for Research in Astronomy (NFRA) with financial support from the Netherlands Organization for scientific research (NWO). This work is supported by NWO grant 614-21-006. ![]() ![]() ![]() ![]() © European Southern Observatory (ESO) 2000 Online publication: March 28, 2000 ![]() |