"Hm, sounds nice... what is it?  Sorry, not an expert here. I just go by what the author himself wrote in the abstract. You know, the part written in laymen terms so that everyone who reads English can get it? Please note where the author says ""Fourier"" but does not say ""least squares"", when describing what his paper is all about. You should be able to get it really; it is a rather brief (and sole) statement. Or did you still not get it that Fourier analysis and LSSA are two different things... Your contradictions with author's abstract are out, of course. Bfigura: can you read English? Please read the abstract too. Thanks guys, for trying too hard.  

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