Central panel: gas kinetic temperatures derived using both T_K(HCN/HNC) (red triangles) and T_K(NH₃) estimatesas function of total gas column density (Lombardi et al. 2014) in the ISF region. For simplicity, we display only positions outside the Orion HII nebula (i.e., I(H41α) ≤ 1.0 K km s⁻¹). Lateral panels: histograms for the distribution of the temperatures (right subpanel) and column densities (upper subpanel) traced by each of these T_K(HCN,HNC) (red bars) and T_K(NH₃) (blue bars) measurements. Note that the histograms are binned in log-space.