Left: ratio [O iii] 88 μm/L_FIR as a function of L_PAH/L_FIR. The color symbols are associated with the regions defined in Fig. 3. The gray symbols denote all of the other pixels of our 30Dor map. The solid curve shows the result of the multiple linear regression, using the values α = 5.4 and β = 11.5. The values indicate the fraction of L_FIR coming from the PDR for three different positions on the curve. Right: ratio of /L_FIR. Black contours represent the total FIR emission. Close to the location of R136, only 20 to 30% of the L_FIR come from the PDRs.