Fig. 16.
Density map of correlation coefficients, ρμα*, ϖ and ρμδ, ϖ. Top: 232 318 sources with the number of visibility periods under 12. Middle: 169 745 sources with the number of visibility periods in the domain [13, 16]. Bottom: 67 296 sources with the number of visibility periods over 17. The colour bar represents the number of quasars in a pixel.
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