Fig. 5.
Breakdown of the 4588 sources in ICRF3 according to frequency band. The circle colored red is for S/X band, the one colored blue is for K band, and the one colored yellow is for X/Ka band. The number of sources found in each colored area is printed within that area, with the number of ICRF3 defining sources (see Sect. 5.2) given in parentheses.
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