New SBN2 configurations #9
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Fix spline generation issue involving trace isotopes of elements that use a spectral function nuclear model
…into sbn/v3_06_02_br
…into sbn/v3_06_02_br
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Plots from @sungbinoh showing the impact of these FFs 
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40k nucleons sampled based on imposing 8 hour threshold for QEL cross section calculation. (250 knots, E max = 1000 GeV --> about 150 knots sampled below the integral nuclear cutoff configured at 10 GeV) Fitting those gives a best-fit which intersects ~7 hours at 40k nucleons, adding uncertainty --> 7.5 hours. Close enough. 
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…ter checking against paper plots
… `minerva` and `lqcd` ones There are now two sets of parameters per dataset, i.e. `minerva`, `minervaFull` and `lqcd`, `lqcdFull`. These correspond to Eqs. (31), (33), (39), and (41) of arXiv:2512.14097
Nature: T. Cai et al (MINERvA), Nature 614 (2023) 48-53 Based on discussions with N. Rowe, A. Papadopoulou and S. Oh
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This is a port of PR #7 opened by @afropapp13 with some reorganisation of tunes.
Adding new tunes for SBN using the MINERvA Nature (T. Cai et al, Nature 614 (2023) 48-53) and elementary-target (A. Meyer et al, arXiv: 2512.14097) papers.
These tunes impact the z-expansion axial form factors. There are a few new sets:
minerva: arXiv, no sum rules applied, kmax=2minervaFull: arXiv, sum rules applied, kmax=2 (+4 = 6)minervaNature: Nature, sum rules applied, kmax=4 (+4 = 8)lqcd: no sum rules applied, kmax=2lqcdFull: sum rules applied, kmax=2 (+4 = 6)Calling @afropapp13 , @sungbinoh , and @nathanielerowe to review.