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Table A.1:

Coefficients of photometric calibration defined by Eq. (4) for the photometric nights used to calibrate the observations of CL0030+2618, CL0159+0030, and CL0809+2811.

Filter
Obs. Date Zf $^{\dagger}$ $\beta_{{f}}$ Colour index $\gamma_{{f}}$ $n_{{\rm par}}$$^{\ddagger}$

g'
2005-10-30 $27.27\pm0.02$ $0.106\pm0.007$ g'-r' $-0.14\pm0.02$ 3
  2005-10-31 $27.15\pm0.02$ $0.124\pm0.008$ g'-r' $-0.08\pm0.01$ 3
  2005-11-01 $27.35\pm0.02$ $0.115\pm0.005$ g'-r' $-0.21\pm0.02$ 3

i'
2005-10-30 $26.49\pm0.02$ $0.127\pm0.004$ r'-i' $-0.11\pm0.02$ 3
  2005-10-31 $26.47\pm0.01$ $0.122\pm0.002$ r'-i' $-0.09\pm0.01$ 3
  2005-11-01 $27.41\pm0.01$ $0.119\pm0.002$ r'-i' $-0.03\pm0.01$ 3

r'
2005-10-30 $26.95\pm0.02$ $0.046\pm0.002$ g'-i' $-0.10\pm0.02$ 3
  2005-10-31 $26.90\pm0.01$ $0.043\pm0.003$ g'-i' $-0.05\pm0.01$ 3
  2005-11-01 $26.96\pm0.01$ $0.048\pm0.004$ g'-i' (-0.10)$^{{\S}}$ 2
  2005-11-08 $26.81\pm0.01$ $0.046\pm0.003$ g'-i' (-0.10)$^{{\S}}$ 2

Notes.  $^{(\dagger)}$ Normalised to an exposure time of $1\mbox{s}$ and an airmass a=0.
$^{(\ddagger)}$ Number of parameters used in the fit.
$^{({\S})}$ Fixed to default value.


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