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Fig. 1
Top: SiO(2–1) to bolometric luminosity ratio, LSiO(2−1)/Lbol, against Lbol/M. Bottom: SiO(2–1) luminosity, LSiO(2−1), against Lbol/M. IR-dark and IR-loud clumps are marked as black and red circles, respectively. Open circles depict sources for which the derived luminosity represents an upper limit (see Sect. 5.1).
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