Relation between [O iii] and MIPS 24 µm. The points are color-coded with the value of log(c_PDR). The different panels correspond to the four bins applied on log(c_PDR), namely [-1,0] (upper left panel), [0,1] (upper right panel), [1,1.5] (lower left panel), [1.5,2] (lower right panel). The black solid line for each panel correspond to the fitted relation on the bin, the black dashed lines represent the 95% confidence interval, and the gray solid line is the relation fitted in Fig. 1 (Sect. 3.1).