Fig. 3
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Spatial map of the dust extinction in M 20. The position of HD 164492A is marked with a grey star. The extent of the measured Strömgren sphere (Sect. 3.4) is shown by a grey dashed circle. The white regions arise from the limited sensitivity to the faint hydrogen emission lines in these spaxels and were masked (see Sect. 2). A uncertainty map is shown in Fig. D.1.
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