t;</span> Origin                         Yes</span>
<span class="r-out co"><span class="r-pr">#&gt;</span> Destination                    Yes</span>
<span class="r-out co"><span class="r-pr">#&gt;</span> Product                        Yes</span>
<span class="r-out co"><span class="r-pr">#&gt;</span> _______________ __________________</span>
<span class="r-out co"><span class="r-pr">#&gt;</span> S.E. type                      IID</span>
<span class="r-out co"><span class="r-pr">#&gt;</span> Observations     