Distribution of lags τ measured on the fiducial light curve for different realizations of the sampling and location of the gaps. The left panel shows the result for the ICCF and the right panel the results for the DCF. The distributions are shown for three different estimators of the lag (cf. Sect. 3.1): 1) the maximum of the correlation function for lags shorter than 1000 days (thick black); 2) the maximum of a Gaussian function fitted on the main peak; 3) The centroid of the main peak.