The SED of 4C55.17 (J0957+5522, top left), 1H1013+498 (J1015+4926, top right), 1RXSJ105837.5+562816 (J1058+5628, middle left), 4C01.28 (J1058+0133, middle right), PKS1057−79 (J1058−8003, bottom left), and Mkn421 (J1104+3812, bottom right). Simultaneous data are shown in red; quasi-simultaneous data, i.e. Fermi data integrated over 2 months, Planck ERCSC and non-simultaneous ground based observations are shown in green; Fermi data integrated over 27 months are shown in blue; literature or archival data are shown in light gray.
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