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There is no polynomial trend line yet. Polycorel is ok, but not quite as elegant as the integrated features of MS Office. There is however FOSS alternative: gnumeric. It's got more capabilities when it comes to regressions, but lacks a bit in compatibility with LibreOffice. I tend to use them side by side and I export finished graphs to png's for \LaTeX\ documents. I sincerely hope LibreOffice will take the opportunity to implement the extra features of the gnumeric fork(at least I think it's a fork, don't quote me on it and don't shoot me if I'm wrong) into the more standard LibreOffice.