Fig. 3.
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Left panel: RadioAstron images of 3C 273 at 1.6 GHz (contours) and 4.8 GHz (in colors) obtained in 2014. Both are convolved with the MOJAVE circular beam (0.83 × 0.83 mas). Right panel: RadioAstron 1.6 GHz image (in colors) with the stacked image from MOJAVE (contours), both convolved with the MOJAVE circular beam of the same size as in the left panel. The two lowest contour levels are ±5 and ±9 times the rms noise level: 5 × 2.8 mJy beam−1 at 1.6 GHz and 9 × 0.5 mJy beam−1 at 15 GHz, respectively. Successive contours are drawn as cn = (3/2)×cn − 1 up to 90% of the total intensity peak (0.7 Jy beam−1 at 1.6 GHz, 6.1 Jy beam−1 at 15 GHz).
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