Integrated spectra of the NH₃ line emission (gray) evaluated over the central absorption region. From top to bottom are displayed spectra of the inversion lines from (2, 2) to (5, 5) as labelled on the bottom right. The absorption feature near the systemic velocity of the region, indicated with a dotted red line (V_sys), is the combination of two, distinct, velocity components. Theoretical positions of the satellite hyperfine lines (HF) are approximately indicated for both components in green and magenta separately, whereas the blue profile draws the best fit spectrum to the ammonia para lines.