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The image reveals two 'caps' of less ionised material at the edge of the nebula
Should it be read as that the material in these regions are less ionised compared to other regions; or that the concentration of ionised particles is lower, or something else?
If it is singly ionized nitrogen; does it have to be mentioned at all? In such case it is already mentioned in the text that green represents singly ionized nitrogen. Gunnar Larsson19:03, 14 September 2006 (UTC)
Images
Why have they suddenly all disappeared? Several beautiful NASA public domain images have been deleted for no apparent reason.