Other lines with similar properties detected at the centre. [Ar VI] 4.529 microns, [AR III] 8.99 microns, [S IV] 10.51 microns, [SIII] 18.71 microns. Focus on [Ar II] (brightest, best spectral resolution) and [Ar VI] (best spatial i 025 resolution). Three images: [Ar VI] A ring with a dot in the middle, [Ar VII] A ring (no dot), and the two images subtracted (just a dot).
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