Fig. 4.
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Best fit (blue) of density-sensitive emission lines, N IV] λλ1483, 1486 (left) and [O II] λλ3727, 3729 (right), using G140M and G395M medium-resolution spectra (black and 1σ uncertainty in grey), respectively. The fit uses two Gaussian profiles with similar widths and the expected position and separation between the two transitions (vertical lines).
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