Histograms of angular separation between BLAZE catalog and eROSITA positions (green) with the distribution of the matched eROSITA source positional uncertainty overlaid (yellow). The vertical line at 8″ indicates the distance threshold for the final sample. The cumulative distribution of the angular separation is shown in blue. a Sample of eROSITA observed blazars with 93% of the matches found within 8″, and 55% and 79% within 3″ and 5″, respectively. b eROSITA observed blazar candidates. Only 81% of matches are within 8″, and 31%/58% within 3″/5″. We show Rayleigh distributions (black) for illustrative purposes, calculated following Merloni et al. (2024, Eq. (3), assuming F = 0.8).