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Change of basis #205

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Change of basis #205

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Enable fitting based on sum and difference basis for polarization states (similar to spin asymmetry)

If used with datasets where taking the difference between ++ and -- saves some reduction steps, this approach can preserve more of the information from the measurement through the fitting.

purnimab and others added 5 commits February 18, 2022 17:07
Added a probe which contains sum and difference cross-sections, an experiment which calculates residuals based on these rather than pp and mm. Save from gui implemented. Also includes error-in-variables.
Don't count dummy variables used for calculating the correct Q as data points when calculating chi2
Added new views to plot difference, Fresnel difference, and difference*Q^4, and correctly calculate spin asymmetry for sum/difference probe
Added functionality to fit 'sum' (mean) and difference
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