[Python] How to find 1 cluster in group of data points

I am trying to find 1 cluster in a group of data, and I am not sure how to do this without selecting all of the data points to be within the cluster (i.e. the particles lost at the beginning of the simulation).

I have attached a gif of the cluster I am trying to identify in my code, and looking to find its root-mean-square radius.



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