LVG models covering a wide range of physical conditions for three different column densities. For six different kinetic temperatures (T_K), the gas temperature variation over a range of H₂ densities is shown. The blue, black, and red colors represent the results for the 22, 183, and 325 GHz lines, respectively. Solid lines represent the expected intensities without continuum emission while dashed lines show the results when infrared pumping from dust is taken into account.