Ok, the data is the temperature dependence of the superfluid density of a superconductor. The theory i am using is a so-called two-gap BCS model, while the classical ona gap BCS model could not reproduce the experimental data well. The fitting parameters are the gap-weight of gap1, the size of gap1 and the size of gap2. You could find the defination of superfluid density and the meaning of gap size from wiki et al., if you are not familar with this topic.
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