Fig. 8.
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Combined FORS2 spectropolarimetric observations of the Ca II triplet lines in IRAS 17163 obtained on 4 and 8 July 2023. The data is unbinned and continuum-subtracted. The polarisation spectrum (top panel) has been corrected due to polarisation bias. The red line in the top panel represents the flux spectrum. The light blue shading indicates the wavelength ranges used for plotting the Ca II line in the Q–U plane (Fig 9).
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