Fig. 5

Results of an experimental observation on 2018 November 20. a, b, respectively, show the Stokes I and V/I spectra of a wavelength range including the Si I 1082.7 nm and He I 1083.0-nm lines acquired at a slit position. c shows a Stokes V/I map of the blue wing of the Si I 1082.7-nm line composed from the data acquired at 26 slit positions, covering a plage region NOAA 12727. The field of view is \(3'.7\) (along the slit) \(\times\; 52''\). d shows a map of the longitudinal magnetic field acquired by SDO/HMI. The solar north is rotated counterclockwise from the top by \(6^\circ \). A part of a HMI full-disk map including the field of view of (c) is shown