Comparison of [CII] (open blue), [NII] (filled black), [CI](2–1) (filled dark gray), [CI](1–0) (filled gray), and C¹⁸ O(1–0) (open red) spectra for positions G0.10+0.02 and G0.07+0.04 in Table 1. Antenna temperatures have been scaled by the factor shown next to the line’s name for display purposes. Gaussian component fits to the [CII] and C¹⁸ O(1–0) spectra are shown in blue and red, respectively. Only dashed-line Gaussian components in the [CII] spectra are used for the analysis in this work as only for them can a counterpart in the C¹⁸ O(1–0) optically thin emission be identified. Vertical dotted black lines show the radial velocity limits for which integrated intensities were calculated for the [NII] line by directly adding the observed emission, multiplied by the spectral channel width, to that LSR velocity range.