Comparison of the images obtained from the RH synthesis and images composed from the IRIS slit scan observations for the inverted FOV and for a narrow range of wavelengths: A: Mg k_2v IRIS image, B: Mg k_2v image obtained from RH1.5D synthesis, C: Mg h_2v IRIS image, D: Mg h_2v image obtained from RH1.5D synthesis, E: Mg II k wing image at 2794.7 Å from IRIS, and F: Mg II k wing image at 2794.7 Å from RH1.5D synthesis. The spectra were integrated over a definite wavelength window as described in Sect. 4.4. Each pair of images was scaled between a common intensity range for efficient comparisons.