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PSR J1903+0327, a millisecond pulsar in an eccentric (e= 0.44) 95‐d orbit with an ∼1 M⊙ companion poses a challenge to our understanding of stellar evolution in binary and multiple‐star systems. Here we describe optical and radio observations which rule out most of the scenarios proposed to explain formation of this system. Radio timing measurements of three post‐Keplerian effects yield the most precise...
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