Hi, Shane, that's very interesting. I've photographed the brightest part of the shock front, but had little idea of the wider field. You've shown that there's a huge glowing elliptical or peanut shaped cloud with quite distinct margins occupying much of the image, centred on the bright cluster.
Nice.
(Had a look at your web site. Your non-astro-photos are superb!)
Best,
Mike
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