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   PR # 41036
   We search for diffuse bow-shock emission from the nearest globular
   cluster M4, to obtain insight into a large-scale flow in the hot
   Galactic halo. If there is a strong outward flow in the halo away
   from the Galactic plane, we would expect the bow shock to be facing
   the galactic plane. We also attempt to detect dim X-ray sources in
   M4, including the millisecond pular PSR B1620-26.
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