Normalized histogram (to the total number of sources in each class) of kinetic temperature for a) the SFS (green), and the QS (black); b) the same as a), but the SFS-2, with L > 10³ L_⊙ (in red) are separated from the SFS-1 (in blue), the red triangle shows the temperature for the Type 3 source; c) the same as a), but the SFS was divided into clumps with (magenta) and without (cyan) radio-continuum emission. Mean and median values of the temperature are indicated in each panel. The total number of sources in each class is shown above each panel.