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Equation Icon  ( dn ) ( ρ )2 ( m )1.09( r )0.91 ( 10 km s−1 )1.18 ---b = 1.52 × 10 −8 --4-n-−-3 ---- --s- ---------- pc −3 yr−1, (37 ) dt tidal 10 pc M ⊙ R ⊙ vm