Polarised spectrum of HD 92207 observed on 2011-05-07 with grism 600B. The top panel shows the observed Stokes I profile (black solid line, in arbitrary units, and not corrected for the instrument response), the rectified PV profile (red line centred about 0; the red smooth solid line slightly offset from zero shows the position of the PV “continuum” prior rectification) and the null profile (blue solid line, offset by −0.75% for display purpose). The PV error bars are represented with a light blue band centred about 0.75%. The slope of the interpolating lines in the bottom panels gives the mean longitudinal field from PV (left bottom panel) and from the null profile (right bottom panel), both calculated using the H Balmer lines only. The regions adopted to derive the magnetic field are shown by thick green lines centred around −0.5. The corresponding ⟨ Bz ⟩ and ⟨ Nz ⟩ values are −190 ± 65 G and −375 ± 65 G, respectively.
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