4 Results

An overview over the results is given in Tables 2, 4, and 5, which list the source name, number of observations, the mean value of the flux density, the modulation index, the reduced $\chi^2$ value, and the variability amplitude. In the last column of each table the variability type is given. The latter was defined using structure functions, as described above. Similarly, the results for the linear polarization data (May 1989 only) are presented in Table 3. The tables listing total intensities are labeled TOT, those with polarization data POL.

The resulting light curves (of the flat-spectrum sources) are plotted in Figs. 2 to 23. For the May 1989 data the polarized flux density and the polarization angle are also given. As an example for the steep-spectrum sources (which were used to check for any instrumental effects and to correct those), see the source 1311+678 in Fig. 1 which was taken from the October 1992 observations at 6cm. Its modulation index was 0.44%.

Figure 1: Steep-spectrum quasar 1311+678, observed in October 1992 at 6cm. After elevation-dependent and time-dependent correction a high accuracy was reached

For all total intensity light curves of the variable sources, structure functions were derived and plotted in Figs. 24 to 40.