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Fig. 2

image

Longitudinal magnetic field values plotted in phase with Prot = 5.370447 d and HJD0 = 2 446 871.89 d for the different groups of lines (from top to bottom: all photospheric He and metal lines, all photospheric lines except He lines, all photospheric lines except N lines, He-only lines, and N-only lines). A fit of the data for a dipole model (red line) is shown in each panel.

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