<p>I found that <code>PARAM_VECTOR</code> did not work when I wrote some tests for it.  So I did some digging in the <code>boost::program_options</code> documentation and figured out how to make it work.  But the usage actually turns out to be a little bit different than expected.  You'll need to do, e.g., <code>-n 0 2</code> or <code>-n 0 -n 2</code> (either works).  I updated the documentation to point that out.  Let me know if my fix does not work for you.</p>

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