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Fig. 2.

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Integrated spectra, corresponding to the different elliptical rings depicted in Fig. 3. Each of the top four panels corresponds to one of the four different VPHs employed in this work. Bottom panel: spectra obtained by combining the spectra from the other four observations. Within each panel, the spectra have been vertically shifted downwards for display purposes, and they are sorted from the innermost to the outermost radius (in colour order: blue, orange, green, red, purple, and brown). For the spectra obtained with the LR-R VPH, we also marked the region where the spectra are severely affected by telluric absorption bands.

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