Table 10: Model fit parameters of the November 2001 and May 2002 narrow band data of $\chi $ Cyg.

Year		 2001 2002

$R_{\star}$ (mas)		   $8.06\pm0.02$   $10.55\pm0.01$
$R_{{\rm layer}}$ (mas)   $15.39\pm0.10$   $18.78\pm0.06$
$T_\star $ (K)   $3211\pm158$   $3316\pm158$
$T_{{\rm layer}}$ (K)  $1737\pm53$  $1685\pm53$
$\tau_{2.03}$   $0.23\pm0.02$   $0.21\pm0.01$
$\tau_{2.15}$   $0.14\pm0.01$   $0.14\pm0.01$
$\tau_{2.22}$   $0.13\pm0.01$   $0.12\pm0.01$
$\tau_{2.39}$   $0.79\pm0.03$   $0.54\pm0.02$

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