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"....offer even better precision in the determination of distances, as good as 18 per cent in the case of optically thin, high-excitation PNe."
From the abstract... I wonder what the typical and worse case accuracy/uncertainty of this new technique?
(this 3 parameter technique is very impressive. I reckon it can be performed with amateur astrometric and optical set set ups - ie if you are keen on working out how far planetary nebulae are)
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