Figure 1:
Light curves for BL Lac.
Figure 2:
Autocorrelation ( ACF) and cross correlation ( DCF) results for BL Lac. The time lag 
is in days.
Figure 3:
Modelling the radio light curve with exponential flares for BL Lac. In the topmost panel is the optical light curve. In the lower panel are the individual model outbursts fitted to the radio light curve. The model light curve calculated from the individual model outbursts along with the radio light curve is plotted in the middle.
Figure 4:
Optical flux level vs. 
and flux of the model radio outbursts for BL Lac. At the epoch of each optical data point the phase and brightness of all the model radio outbursts and brightness of model light curve are calculated.
The results are calculated by averaging the optical flux in each of the ten intervals. The error bars indicate the standard error of the mean. The dots are connected for clarity.
Figure 5:
The light curves for S2 0109+224.
Figure 6:
The DCF results for S2 0109+224.
Figure 7:
The TDF decomposition to individual outbursts for S2 0109+224 37 GHz light curve (see Fig. 3 for further explanation).
Figure 8:
Optical flux level vs. the phase 
and the flux level of individual outbursts and model light curve for S2 0109+224 (see Fig. 4 for further explanation).
Figure 9:
The light curves for PKS 0735+178.
Figure 10:
The DCF results for PKS 0735+178.
Figure 11:
Same as Fig. 7 for PKS 0735+178.
Figure 12:
Same as Fig. 8 for PKS 0735+178.
Figure 13:
The light curves for 1156+295 (4C 29.45).
Figure 14:
The DCF results for 1156+295 (4C 29.45).
Figure 15:
The light curves for 2251+158 (3C 454.3).
Figure 16:
The DCF results for 2251+158 (3C 454.3).
Figure 17:
Same as Fig. 7 for 2251+158 (3C 454.3).
Figure 18:
Same as Fig. 8 for 2251+158.
Copyright ESO 2002
