NANOGrav 12.5y KDE representation for Ceffyl

Reference: Lamb, Taylor and van Haasteren. The Need For Speed: Rapid Refitting Techniques for Bayesian Spectral Characterization of the Gravitational Wave Background Using PTAs. Phys. Rev. D 108, 103019 – Published 13 November 2023

This is a downloadable KDE (Kernel Density Estimator) for the NANOGrav 12.5y dataset that can be used with the Ceffyl package.   Please see the GitHub page for Ceffyl installation details and usage information. 

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