Fig. 3
a) MCELS Hα image with contours. The lower contour limit has been adjusted to highlight the Hα shell that confines the X-ray emitting gas. The levels correspond to four logarithmically spaced intervals between this adjusted lower limit and the maximum pixel value. b) 0.3−1 keV XMM-Newton image with the Hα contours overlaid. c) 0.3−1 keV XMM-Newton image with superbubble emission regions indicated.
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