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Table 6:

Upper limits ($3\sigma $) on the optical counterpart of XTE J1751-305.
Filter ${\lambda}_{\rm c}$ Limiting magnitude $A_{\lambda}$ Absolute mag
  (Å)   (mag)  
R 6500 >23.1 $4.03 \pm 0.02$ >4.6
I 8000 >21.6 $2.91 \pm 0.02$ >4.2
Z 9625 >20.6 $2.12 \pm 0.02$ >4.0
J 12500 >19.6 $1.35 \pm 0.02$ >3.7

Values in column three are uncorrected for reddening (from Jonker et al. 2003). In column four are reported the dereddening parameters we used to correct for interstellar absorption computed assuming $E(B-V)=1.69 \pm 0.02$ mag The absolute magnitudes are computed assuming a distance of 8 kpc (Wijnands et al. 2005; see Sect. 4.3.1 for details).

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