Stacked polarization images at 15 GHz (left), 23 GHz (center), and 43 GHz (right). Before stacking, the individual images were convolved with the median beam (indicated by the gray ellipse) at each frequency separately. Contours show the total intensity, starting at four times the noise level and increasing by factors of two. The color map displays linear polarization, and the sticks indicate the direction of the EVPA.