Total intensity maps of the Boomerang at 1420 MHz (top left), 4.85 GHz (top right), 8.35 GHz (bottom left), and 10.45 GHz (bottom right). The black cross marks the position of the pulsar J2229+6114. The black circle in the top‐left corner indicates the beam size. Contours levels are at: 6.5, 7, 7.5, 8, 9, 10, 11, and 12 K at 1420 MHz (﹩1\ \mathrm{K}\,=4.4﹩ mJy beam^-1); 10, 15, 20, 25, 30, 35, 45, and 55 mJy beam^-1 at 4.85 GHz; 3, 6.5, 10, 13.5 17, 20.5, 24, and 27.5 mJy beam^-1 at 8.35 GHz; and 2, 4, 6, 8, 10, 12, 14, and 16 mJy beam^-1 at 10.45 GHz.