A decade of SN 1993J: discovery of radio wavelength effects in the expansion rate

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Table 4:

Spectral indices, $\alpha$ , determined from our VLA data for a subset of observations for which we have quasi-simultaneous 6 and 18 cm observations (M 81 used as calibrator).
Age (days)	$\alpha$
2794	$0.68\pm0.01$
2820^a	$0.67\pm0.02$
3511	$0.555\pm0.010$
3858	$0.50\pm0.04$

^a From Pérez-Torres et al. (2002).

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