Subplot a) shows the comparison of the optical flux in R (F_R) and V (F_V) band for PKS 0048−097 for simultaneous observations. The Pearson correlation coefficients for the two cases of a full set of data – solid line and without one data point (in right upper corner in the plot) – dashed line, are provided in the lower right corner. The following subplots show the relation for shifted light curves for b) the radio flux, F_RADIO vs. F_V; c) integrated gamma-ray flux, I_γ vs. F_V; and d) I_γ vs. F_RADIO. The light curves are shifted by Δt according to τ_max shown in Table 4. In the lower right corner the Pearson correlation coefficients are provided.