R help - Apr 2013 - Outlier Detection

I am about to evaluate the outlier detection mode of random forests.
   At
   [1]http://www.stat.berkeley.edu/~breiman/RandomForests/cc_home.htm#outliers
   the raw outlier measure for a case n is defined as

   nsample/AverageProximity

   I wasn't able to figure out, what "nsample" stands for. Can
anyone help me?

References

   1. http://www.stat.berkeley.edu/~breiman/RandomForests/cc_home.htm#outliers