DCF (upper panel) and ICF (lower panel) cross-correlation coefficients between the Fermi/LAT γ-ray and ALMA 7 light curves plotted over time lag. For the DCF the bin size is chosen to be 21 days, while the interpolation unit for the ICF is chosen to be 10 days (both calculated as explained in Sect. 2.4.1). Positive time lags mean that the radio light curve follows the Fermi/LAT γ-ray light curve. The time lags for the peak cross-correlation coefficients are marked by solid blue lines, with their 1σ uncertainties given by the shaded blue area. The dotted red, dashed-dotted orange, and dashed green lines correspond to the two sided Gaussian equivalent 1σ, 2σ, and 3σ confidence intervals.