In this case the clusters' Recalls were 0.99 but their Precissions were 0.44 and 0.55 with F-factors of 0.61 and 0.71 respectively. The internal structure of their common spike group in the 2D embedding space shows that the similarity of their spikes changes in a uniform way and that there are some spikes from the two groups that are quite similar, thus causing the embedding to overlap the two units.