Fig. 5.
Variations in the [S II] 671.6 nm nebular line along the slit, which is modeled with a triple Gaussian model. The variations are shown for one of the nodding mode positions of S4. Top: variations in the peak flux of each GD along the slit. Middle: variations in the central wavelength or RV shift of each GD along the slit. Bottom: variations in σ of each GD along the slit. In the dark, lighter, and lightest vertical gray zones, we show the 1σ, 2σ, and 3σ seeing ranges of the object, respectively. For more information, see the text.
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