FORS1-Norma (since 2008-04-01)

 filter  extinction        colour          zeropoint
         coefficient        term
         value  error    value  error     value  error
 U_BESS  0.447  0.018   +0.043  0.008    26.080  0.031
 B_BESS  0.241  0.013   -0.128  0.008    28.163  0.023
 V_BESS  0.112  0.012   -0.015  0.007    28.227  0.023
 R_BESS  0.087  0.014   -0.097  0.015    28.024  0.025
 I_BESS  0.027  0.021   -0.101  0.011    27.023  0.034
 u_HIGH  0.437  0.033   +0.066  0.012    26.572  0.049
 b_HIGH  0.222  0.020   +0.048  0.009    28.539  0.031
 v_HIGH  0.139  0.018   +0.019  0.008    28.410  0.029
 g_HIGH  0.209  0.022   -0.096  0.008    28.867  0.032


 FORS1-Marlene (since 2008-04-01)

 filter  extinction        colour          zeropoint
         coefficient        term
         value  error    value  error     value  error
 U_BESS  0.470  0.024   +0.039  0.013    26.069  0.041
 B_BESS  0.316  0.019   -0.124  0.012    28.221  0.032
 V_BESS  0.158  0.018   -0.011  0.012    28.247  0.033
 R_BESS  0.111  0.018   -0.047  0.022    28.009  0.033
 I_BESS  0.037  0.019   -0.100  0.012    27.038  0.035
 u_HIGH  0.445  0.051   +0.063  0.018    26.548  0.070
 b_HIGH  0.282  0.036   +0.059  0.016    28.563  0.052
 v_HIGH  0.155  0.030   +0.019  0.014    28.388  0.046
 g_HIGH  0.287  0.063   -0.106  0.019    28.938  0.082