RadioAstron images of 3C 273 at 1.6 GHz (left panel, June 2014) and 4.8 GHz (right panel, April 2014). The beam is shown on the lower-left corner: 1.04 × 0.58 mas, PA 79.4° at 1.6 GHz, and 0.86 × 0.46 mas, PA 22.0° at 4.8 GHz. The two lowest contour levels are ±3 and ±7 times the rms of the image noise level (3 × 3.5 mJy beam⁻¹ at 1.6 GHz, 7 × 2.2 mJy beam⁻¹ at 4.8 GHz). Successive contours are drawn as c_n = (3/2)×c_n − 1 up to 90% of the total intensity peak (0.57 Jy beam⁻¹ at 1.6 GHz, 2.01 Jy beam⁻¹ at 4.8 GHz).