Fig. 3
Backgroud image of the Red Rectangle protoplanetary nebula as seen in the red (left panel; taken from Koning et al. 2011) and in the blue (right panel; taken from Cohen et al. 2004). The lines represent the direction of the polarisation of the continuum (red), the Balmer lines (blue) and the Ca ii K line (green). The size of the lines represents the degree polarisation with respect to the continuum value.
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