DRAO 21 cm polarized intensity map of the Monoceros SNR at an angular resolution of 36′. Polarization vectors in the B-field direction (E+90°) are overlaid. The length of the vectors is proportional to PI. A polarized intensity of 1 mK T_B corresponds to a length of 0.05′. Contours show total intensities starting at 200 mK T_B and increasing by 2ⁿ ×   60 mK T_B (n = 0,1,2,3,...). The positions of RM sources in Taylor et al. (2009) are indicated by crosses, with lengths proportional to the RM values.