Maps of one scan at 459 nm (bottom left panel), 526 nm (bottom right panel), and 614 nm (top panel). Left to right: continuum intensity, I_c, polarization degree p_max, and mask of significant polarization signal. The vertical bright stripes in p_max for 459 and 526 nm were caused by a temporary loss of the synchronization between polarization modulation and exposures during the scanning.