Map of the polarized flux I × p_L in the nebula of RS Pup (in e⁻ s^-1). The red contours enclose the regions that were selected for the distance fit. The artifacts and background stars have been masked, and the yellow cross marks the position of RS Pup. The dashed yellow circles mark 30′′ and 60′′ angular separations from the Cepheid, and the FoV is 68.3′′ × 68.3′′ with north up and east to the left.