Results of Gaussian fits. The listed sequence of clouds follows the layout of the GMCs of the CMZ as shown in Figs. 1–3. (a) Systemic velocities for each species as a function of the regions. If a strong difference is seen in the low- and high upper-level energy transitions of the species, the two velocity components are shown. (b) FWHM for each species as a function of the regions. If, for one species, a difference in line width is seen between the low- and high upper-level energy transitions, the two components are shown.