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Swap Q0 and nf0 for Qref and nfref #329

@felixhekhorn

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@felixhekhorn

I believe the only relevant appearance of Q0 and nf0 is here:

origin=(new_theory["Q0"] ** 2, new_theory["nf0"]),

where we use them to construct the atlas for the structure functions (i.e. how many light flavors per Q2). However, this is only needed to provide a reference point (since the class requires that), but I think we never compute any paths, i.e. any reference will do.

I suggest to use Qref and nfref instead, which you may need for alphas, if you use the interface through yadism to eko. The core functionality of yadism is of course independent of $\alpha_s$ and its configuration.

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