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Fig. 6

image

Computed Stokes u continuum polarization for the unpolarized standard star HD 38393 observed January 10th 2013. Spectral averaging by a factor of 80x for high S/N has been applied. At this spectral binning there are 50 spectral points per spectral order. Each spectral order is shown in a different color for this wavelength range. The different colors nearly overlap but with 0.1% offsets. The intra-order and inter-order variation is a stable function representing the ~0.5% variation across each spectral order. The telescope induced polarization causes the curves to change slowly with time and with wavelength. The total time elapsed during this data set was 92 min (09:59z to 11:31z). The statistical noise limits are smaller than 0.05% per pixel at this spectral binning.

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