Table 2: Time evolution of the spectral index ( $F_\nu \propto \nu ^{-\alpha }$). Galactic (but not intrinsic) extinction has been accounted for by assuming  AV = 0.42.
UT # Telescope Bands $\alpha$
13.28 A Baade 6.5 m VRI $1.06\pm0.06$
13.31 B Baade 6.5 m VRI $1.00\pm0.05$
13.88 C AZT 1.1 m RJK $0.85\pm0.14$
14.04 D Baade 6.5 m BVRI $1.15\pm0.05$
15.04 E TNG 3.5 m UBVRIJHK $1.01\pm0.04$
16.01 F TNG 3.5 m BVR $0.72\pm0.22$
All - - - $1.04\pm0.03$

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