Dear List

Is there a package for leapfrog plotting (Hamiltonian Monte Carlo
estimation) in R?  I tried the actual "LEAPFrOG" package which doesn't
actually give the plot like this one?
http://xianblog.files.wordpress.com/2010/09/hamilton.jpg

How doe one plot this in R?  So, there semi-circle and dots on that
semi-circle.
I don't think curve() or plot() would produce such plot.  Thanks in advance!

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