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Fig. 5.
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Doppler factor versus frequency in log–log space for 0234+285 (panel a) 0420–014 (panel b), 1253–055 (panel c), and 2251+158 (panel d). The red dashed line shows the best-fit relation estimated in the 4.8–37 GHz range. The dashed black line in panel c is the best-fit relation estimated in the 100–350 GHz range.
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