Spectrograph distortion in sunspot line profiles
Journal article published in 1991 by
V. Mart�nez Pillet,
J. S�nchez Almeida 
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Abstract
We show empirically how the effect of the instrumental polarization of the spectrograph can distort the shape of the intensity profiles in sunspots. In order to avoid the problems an analysis of the polarization of the light should be performed at the entrance slit of the spectrograph.