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PB: I did another fit starting from fit4 and removing the TIG1a, 1b, which are filtering the in-ring torsions, and making TIG0 an interpolated parameter instead of a general torsion parameter. The objective function values are here. Each fit (fits 4 and 7) is the better performing one on its training set so this is not a good value to compare, I am running benchmarks on a small set for these fits now.
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