Spectral observations of the Mg II h line. (a) and (d): Stigmatic spectral image. The left bars mark the limits for calculating averaged spectral profiles, and the right bars mark the position of spectral profiles from single spatial pixel. (b) and (e): Averaged profiles. (c) and (f): Profiles from single spatial pixel. The marked profile characters include integrated intensities in 10⁴ erg cm⁻² sr⁻¹ s⁻¹, FWHMs in Å, FWHMs in km s⁻¹, LOS velocities by gravity center method in km s⁻¹, and LOS velocities by profile centers identified by peaks or valleys in km s⁻¹, which are marked with red pluses.