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Fig. 1

A Midcourse Space Experiment (MSX, Egan et al. 2003) image in the infrared taken at 8.3 μm, together with ROSAT PSPC (0.1–2.4 keV) contours. The MSX image shows the emission from interstellar dust. The white cross marks the position of the OH (1720 MHz) masers. The white box indicates the field of the sky shown in Fig. 2.
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