Fig. A.1
Spitzer MIPSGAL 24 μm image in MJy/sr units with HESS J1808−204 excesssignificance contours (6, 5, 4σ as for Fig. 1) overlaid as solid white lines. Locations of the stellar cluster Cl* 1806−20 (containing SGR1806−20 and LBV 1806−20) and the Fermi-LAT GeV source 3FGL J1809.2−2016c (68% location error) are indicated. The bright infrared feature to the north-east towards the Fermi-LAT source is the W31 giant HII star formation complex.
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