Polarization spectrum of NGC 1365N, binned over 30 spectral pixels (100 Å), plotted in the normalized Stokes q, u plane. The black crosses represent the data, with their error bars. The solid black line represents the polarization model fitted to the data. The model is a combination of polarization scattering at θ ≃ 125° and polarization due to dichroic extinction at θ ≃ 165°, the individual components being indicated by the red and blue solid lines, respectively. The red crosses represent the measured q, u parameters corrected for dichroic extinction, with error bars.