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Finally nabbed it.
Very similar to Nova Cen - a classic Fe nova. In fact I've also included a comparison image with V1369 Cen on 19 Jan, a comparable time after maximum. In Nova Sgr 2014 the [OI] lines at 5577 and 6300 have developed a little quicker; and for some reason the H emission gamma line is missing altogether in Nova Sgr. But otherwise the spectra are pretty much identical in terms of composition.
Cheers
Jonathan
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