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Table 1

Details of the observations.

Date Filter

25 May 2010 Na continuum (0.590 ± 0.001   μm)
25 May 2010 Na line (0.580 ± 0.001   μm)
24 May 2010 Hα continuum (0.670 ± 0.001   μm)
24 May 2010 Hα line (0.660 ± 0.001   μm)
25 May 2010 Sloan I (0.76 ± 0.08   μm)

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