Table 1: Parameters of M 3/V 9 and UW Gru.
  UW Gru Ref. M 3/V 9 Ref.
period [d] 0.5482104   0.5415552  
${\langle B-V\rangle}$ [mag] 0.36 1 0.33, 0.39 2, 3
E(B-V) [mag] 0.10 1 0.01 4
${\rm [Fe/H]_{phot}}$ [dex] -1.51   -1.53  
${\rm [Fe/H]_{spect}}$ [dex] -1.68, -1.41 5, 6 -0.87 7
1) Bernard (1982); 2) Benko et al. (2003); 3) Corwin & Carney (2001); 4) Harris (1996);
5) Layden (1994); 6) Jurcsik & Kovács (1996); 7) Sandstrom et al. (2001).

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