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Table 1:

Atmospheric extinction and photometric calibration coefficients.
Filter $\kappa$ ca ZPa ZPb ZPc
V 0.187 -0.108 20.899 $\pm$ 0.024 20.874 20.954
R 0.135 -0.110 21.208 $\pm$ 0.030 21.202 21.220
I 0.072 -0.147 20.629 $\pm$ 0.020 20.577 20.608

a From SA 98 standard area observed on December 23, 2006. b From SA 94-242 observed on January 17, 2007. c From SA 96-36 observed on January 18, 2007.

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