To check which coefficients were applied to the frame zeropoints, the
date of processing is relevant, NOT the observing date! As a rule of
thumb, data are processed on average 10 days after they were observed.

            extinction              colour            colour
            coefficient             term
until 
2006-07-18

U_SPEC       0.41                   +0.10              U-B
B_BESS       0.21                   -0.09              B-V
V_BESS       0.16                   +0.05              B-V
R_SPEC       0.13                   +0.02              V-R
I_BESS       0.09                   -0.08              V-R

2006-07-25 
to
2006-08-01

U_SPEC       0.443                  +0.076             U-B
B_BESS       0.241                  -0.027             B-V
V_BESS       0.156                  +0.023             B-V
R_SPEC       0.124                  +0.008             V-R
I_BESS       0.081                  -0.017             V-R

since 
2006-08-02

U_SPEC       0.443                  +0.076             U-B
B_BESS       0.217                  -0.033             B-V
V_BESS       0.127                  +0.022             B-V
R_SPEC       0.098                  +0.009             V-R
I_BESS       0.060                  -0.017             V-R

Last update 2007-04-25