cluster_toolkit
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Change the Sigma(R) call to not need NFW parameters
Currently the function Sigma_at_R() takes in NFW parameters, despite taking a whole correlation function as input. The NFW parameters are not necessary unless R_perp < r, in which case a model must be assumed (such as NFW) below r[0].
The default behavior should get rid of needing NFW parameters and a method should be implemented to chose the model below the small scale.