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Published online by Cambridge University Press: 25 November 2011
We present HIFI observations of [CII] and high-J transitions of CO and HCO+ atpositions in S140 and DR21. We use a clumpy PDR model to model and interpret the observedline intensities. The emission from both massive star forming regions can be reproduced byassuming a clumpy, 2-component PDR scenario.