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Fig. 1

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The locations of the observed fields. The background is the IRAS 100 μm map and the circles denote the positions of the fields. The arrows drawn on each circle indicate the distances, starting with 0 pc for the upright direction, one clockwise rotation corresponding to 2 kpc. The six sources with distances larger than 1.5 kpc are drawn with smaller symbols. The sources without reliable distance estimates are marked with crosses.

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