Table 2: Optical broad-band imaging photometric calibration parameters.
Band Zero point Colour coeff. Extinction coeff.
  (for 1 ADU s-1)    
B 25.94 $\pm$ 0.01 0.029 $\pm$ 0.006 -0.20 $\pm$ 0.01
V 25.84 $\pm$ 0.01 -0.062 $\pm$ 0.003 -0.112 $\pm$ 0.007
R 25.67 $\pm$ 0.01 -0.10 $\pm$ 0.01 -0.076 $\pm$ 0.007

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