Continuum-subtracted spectrum of the [N II]_{205 μm} (upper panel) and [O I]_{146 μm} (lower panel). The spectra (black lines, shaded blue) are extracted in r = 1″ apertures centered on the peak of the emission in the velocity-integrated maps (Figure 3) using residual scaling (see Section 2). The 1σ noise level per channel for an r = 1″ aperture is shown in red, and a single-Gaussian fit is shown in orange (the best-fit parameters and uncertainties are in the upper right corners).