Sky location of blended 12-month catalogue UCBs. In the top and bottom graphs, the sky location of blended 12-month catalogue UCBs are highlighted here as dark pink and yellow crosses with a black border. The underlying distribution of points are all catalogue UCBs meeting a certain correlation threshold. This threshold is M_ij > 0 8 in the top, and the range of 0 5 < M_ij < 0 8 is used in the bottom graph. The highest concentration of points is near the galactic centre. The overlapping dark pink markers represent catalogue UCBs that have a match with more than one injection (the second type of blending described in Sect. 4). Each of the, more sparse, yellow markers represent a catalogue UCB that fits the same injection as another catalogue UCB (the first type of blending described in Sect. 4). For M_ij > 0.8, the first type of blending is absent in the 12-month catalogue. One can see that most of the blended catalogue UCBs are near the galactic centre.