Mantel results shown in a graphical (histogram) form.

I am new at 'R' and not even sure whether I am contacting the appropriate
forum!! However, I have carried out several mantel tests (using 'R') on
genetic data and would like to plot the results in the form of a histogam of
the distribution - and preferably use a procedure that shows the critical
'r' value.
The tail end of my analysis is shown below. I just need help to dig out an
instruction to follow on from this result.

mantel.rtest(sample.dists, cat.dists, nrepet = 9999)

Monte-Carlo test
Observation: 0.4431225
Call: mantel.rtest(m1 = sample.dists, m2 = cat.dists, nrepet = 9999)
Based on 9999 replicates
Simulated p-value: 1e-04

Colin.

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