Table 2: Extinction and calibration coefficients for the optical observations.

Extinction Coefficients
  September 1999 November 1999 December 1999

$k_{\rm b}$

 $0.232 \pm 0.017$ $0.266 \pm 0.010$ $0.233 \pm 0.031$
$k_{\rm v}$ $0.140 \pm 0.014$ $0.160 \pm 0.011$ $0.145 \pm 0.025$
$k_{\rm r}$ $0.078 \pm 0.015$ $0.115 \pm 0.013$ $0.080 \pm 0.021$
$k_{\rm i}$ $0.049 \pm 0.010$ $0.067 \pm 0.008$ $0.064 \pm 0.023$

Calibration Coefficients

$\alpha_{\rm o}$

 $ 1.606 \pm 0.036$ $ 3.733 \pm 0.006$ $3.058 \pm 0.004 $
$\alpha_{\rm 1}$ $ 0.033 \pm 0.056$ $ 0.022 \pm 0.010$ $-0.005 \pm 0.008 $
$\beta_{\rm o}$ $ 0.864 \pm 0.023$ $ 0.185 \pm 0.005$ $0.722 \pm 0.005$
$\beta_{\rm 1}$ $ 0.815 \pm 0.035$ $ 0.884 \pm 0.008$ $0.821 \pm 0.010$
$\epsilon_{\rm o}$ $0.269 \pm 0.019$ $ 0.206 \pm 0.006$ $0.296 \pm 0.005$
$\epsilon_{\rm 1}$ $1.050 \pm 0.051$ $ 1.070 \pm 0.021$ $1.055 \pm 0.017$
$\gamma_{\rm o}$ $ 0.000 \pm 0.007$ $ -0.118 \pm 0.019$ $0.090 \pm 0.021 $
$\gamma_{\rm 1}$ $ 1.076 \pm 0.010$ $ 1.075 \pm 0.031$ $1.070 \pm 0.035$


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