Table 1: Observation log.
Date Wavelength range ($\mu $m) Ba( ${}^\circ $) B'b( ${}^\circ $) $\alpha^{c}$( ${}^\circ $) Air mass Solar analog star
2000 Oct. 6 0.8-2.5,2.0-4.2 -24.14 -23.46 4.7 1.00-1.13 SAO93936
2000 Oct. 7 0.8-2.5,2.4-5.5 -24.13 -23.47 4.6 1.00-1.22 SAO93936, SAO94114
2001 Dec. 8 0.8-2.5,2.4-5.5 -25.85 -26.104 0.6 1.00-1.43 SAO93936
$\textstyle \parbox{14.cm}{ {\footnotesize $^a$\space Ring angle opening as seen... ... angle opening as seen from Sun.} \\ {\footnotesize $^c$\space Phase angle.} }$


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