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Re the decreasing hydrogen amplitude ratios: I think it is real, and not a result of Ha saturating. I will be attending the RASNZ conference in Wellington next weekend and, fortuitously, Bill Allen will be presenting a paper on Eta Carinae. He has been observing this star for 30 years and knows a lot about its behavour ... in fact his paper puts forward the theory that it has a companion with a period of 5.5 years. I will discuss the H amplitude matter with him.
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