Example of rotational (bottom) and LVG (top) diagrams of NH₃. Left: Halo 4. Right: Disk X1-2. In the Boltzmann diagram (bottom), para-NH₃ species are fitted with the red line, and the ortho-NH₃ species are fitted with the blue line. In the LVG diagrams (top), we plot the peak intensity of the metastable inversion transitions of para-NH₃. For the source Halo 4, we derive only one kinetic temperature component (warm), which is plotted in red lines, and the error in red shaded region. The source Disk X1-2 was modeled using a two-kinetic-temperature component model, one warm and one cold, which were plotted in red and blue lines, respectively, with the correspondly associated error shown as shaded regions. We show the n(H₂) used in the LVG model for the warm and cold components. To estimate the uncertainty of the derived parameters, we computed the χ² of the line intensities over the grid used for the LVG model. We impose , which translates in the 68.3% (1σ) confidence level projected for each parameter axis (see text for details).