I tried the extended likelihood fit in RooFit but couldn't get it to minimise, although I didn't spend huge amounts of time on it. I also tried implementing the method myself but it gets unstable for large binning.
As a fall back I decided to get results with the chi2 fit but with the combined errors from the templates and data, but results aren't good for ILD_00. The templates look fairly good though; template is here and data is here. That's for a polarisation of 80-30 for electrons-1 positrons+1.
These are the results I get. I'm currently playing around to see if changing the polarisation or luminosity changes anything.
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