Table 3: Average flux densities of M 81*, $S_{\rm 3~mm}$ and $S_{\rm
1~mm}$, measured at $\nu_{\rm
3~mm}$ and $\nu_{\rm
1~mm}$ during the three epochs of the campaign. The mean and standard deviation (not the error of the mean) were calculated from the unweighted individual measurements shown in Fig. 3. The last column lists the average spectral indices and their standard deviation (not the error of the mean) calculated from all individual measurements as shown in the right panels of Fig. 4.
Start [UT] End [UT] $\nu_{\rm
3~mm}$ [GHz] $S_{\rm 3~mm}$ $\nu_{\rm
1~mm}$ [GHz] $S_{\rm
1~mm}$ $\alpha$
24-Feb.-2005 01:11 24-Feb.-2005 19:45 115.3 $88.0\pm11.7$ 230.5 $85.6\pm17.8$ $-0.06\pm0.16$
14-Jul.-2005 06:50 15-Jul.-2005 13:51 80.5 $241.2\pm33.8$ 241.4 $181.2\pm39.1$ $-0.38\pm0.17$
19-Jul.-2005 23:17 20-Jul.-2005 16:07 86.2 $118.7\pm11.4$ 218.2 $74.8\pm13.3$ $-0.51\pm0.15$


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