Fig. A.1
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FORS polarisation spectra of 43 stars. The grey lines show the original data, and the black open circles (with 1 σ error bars) represent the data re-binned to a spectral resolution of λ/Δλ ~ 50. The green circles represent the measurements available in the catalogue by Heiles (2000). The magenta lines show the best fits obtained with the Serkowski formula.
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