Maps of height of formation (HOF) for different line pairs deduced from the centroid of the response function (RF) of Stokes I profiles to temperature, at the central wavelength. First and second rows: distribution of HOF referring to individual spatial pixels of the MHD cubes is shown. Third row: difference (absolute) in the HOF is shown. Fourth row: histogram of the HOF of the two lines in each pair is shown. Fifth row: histogram of the absolute differences in the HOF is shown.