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Fig. 1

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Illustration of the survey area from a bird’s eye perspective, and of the two ways in which we analysed our cloud sample. The picture shows the molecular cloud sample (filled red circles; the size of the circles scales with the physical size of the clouds; see also Fig. 3). The empty white circles represent apertures of various sizes. Background image credit: NASA/JPL-Caltech/R. Hurt (SSC/Caltech).

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