Polarized intensity maps of the Boomerang at 1420 MHz (top left), 4850 MHz (top right), 8350 MHz (bottom left), and 10450 MHz (bottom right). E vectors are overlaid. The black cross marks the position of the pulsar J2229+6114. The black circle in the top left corner indicates the beam size. Contour levels are at: 0.2, 0.4, 0.6, 0.8, 1.0, 1.2, 1.4, and 1.6 K at 1420 MHz (﹩1\ \mathrm{K}\,=4.4﹩ mJy beam^-1); 2, 4, 6, 8, 10, 12, 15, and 20 mJy beam^-1 at 4.85 GHz; 0.5, 1, 2, 4, 6, 8, 10, and 12 mJy beam^-1 at 8.35 GHz; and 0.5, 1, 2, 3, 4, 6, 8, and 10 mJy beam^-1 at 10.45 GHz.