For the region 30 Dor, the predicted map of [O iii] given the observed 24µm (panel a) is compared to the actual map of [O iii] observed with Herschel/PACS (panel b), and the ratio of observed over predicted emission (panel c). The distribution of [C ii] and [O i] emission (panels d and e respectively) are overlaid with the [O iii] line contours. The ratio of R_CII/PDR (panel f), R_PDR/_HII (panel g) and c_PDR with associated uncertainties (panel h and i respectively) are also presented with the [O iii] line contours. The observed ratios [O iii]/24µm and [O iii]/70µm presented as a function of R_PDR/HII are compared to our grid of models (panelj and k respectively). The large cross is the value integrated on the global region.