Distribution of the estimated background AGN contamination fraction in the SFR-M_⋆-D stack bin in our sample. The contamination fraction assuming the eRASS1 flux sensitivity limit of each individual galaxy. The median value of the distribution is 17%. The total surface of the 5 stacks with contamination fraction higher than 50% is significantly higher than all the rest used in our analysis resulting in an overestimation of the background AGN contamination.