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Background Polynomial

A Chebyshev polynomials of the first kind as described at is used by default in Topas. The recurrences relations of Eq. (26) can be used with the x axis normalized to be between -1 and 1. Thus your T1(x) should start at -1 for the first data point and end at 1 for the last data point.

You can use your own polynomial function by using the fit_obj syntax.

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