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I'd be interested in some feedback on how it works with meaningful data - i.e. several data point within the R0 radius.

I'm not sure I interpreted your requirements correctly. Your sample file doesn't have any line's coordinates within radius 50 from any other, so any test is impossible for that set (it did some...

So - is S2 the input file? How many lines? Will the calculations be done for every line in the file (lets call that ALLINES) or just for the first num lines? Yielding ALLINES * ALLINES result lines...

Without understanding what exactly you are doing to that file, I can see that you are creating 15 processes to run 15 commands on every single line, which will have a serious effect if done for many...