... website

http://www.cv.nrao.edu/nvss/

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... catalogue

http://sundog.stsci.edu/

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... length

Note that the spatial correlation length is not a physical lengthscale in the space distribution of galaxies. It is just defined as that length at which $\xi(r)$ is unity (i.e. the chance of finding a galaxy at the distance r₀ from another galaxy is twice the Poissonian chance).

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